FESB

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define _CRT_SECURE_NO_WARNINGS
//1.
int main() {
	int cnt = 0, sum = 0, num = 0; float aritm = 0.0;
 
	do {
		printf("Unesi broj\t");
		scanf("%d", &num);
		if (num == 0) {
			break;
		}
		cnt++;
		sum += num;
	} while (1);
	aritm = (float)sum / cnt;
	printf("Aritmeticka sredina je %f.\n", aritm);
}
//2.
int main()
{
	int br = 0, rem = 0;
	printf("Unesi broj:\t");
	scanf(" %d", &br);
	if (br < 0) {
		printf("- ");
		br *= -1;
	}
	do {
		rem = br % 10;
		printf("%d ", rem);
		br /= 10;
	} while (br != 0);
}
//3.
int main()
{
	int rnd = 0, guess = 0, cnt = 0;
 
	srand((unsigned)time(NULL));
	rnd = rand();
	do {
		printf("Unesi broj:\t");
		scanf(" %d", &guess);
		cnt++;
		if (guess < rnd) {
			printf("Random broj je veci od unesenog!\n");
		}
		else if (guess > rnd) {
			printf("Random broj je manji od unesenog!\n");
		}
 
	} while (rnd != guess);
	printf("BINGO!\n");
	printf("Potrebno je bilo %d pokusaja.\n", cnt);
}

//4.
int main()
{
	int temp;
	for (int i = 1; i <= 100; i++)
	{
		temp = 1;
		for (int j = 2; j < i; j++)
		{
			if ((i % j) == 0)
				temp = 0;
		}
		if (temp)
			printf("%d ", i);
	}
}
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define _CRT_SECURE_NO_WARNINGS

//1.
int main()
{
	float broj;
	printf("Unesite realan broj:\t");
	scanf("%f", &broj);

	if ((broj - (int)broj) >= 0.5)
		printf("%d", (int)broj + 1);
	else if ((broj - (int)broj) <= -0.5)
		printf("%d", (int)broj - 1);
	else
		printf("%d", int(broj));

}
//3.
int main()
{
	int broj, temp = 0;
	for (int i = 0; i < 10; i++)
	{
		printf("Unesi %d. broj.\n", i + 1);
		scanf("%d", &broj);
		printf("\n");
		if (broj % 3 == 0)
			temp++;
	}

	printf("%d unesena/ih brojeva djeljivo je s 3.\n", temp);
}
//4.
int main()
{
	char slovo; int br_H = 0, br_ms = 0;
	for (int i = 0; i < 10; i++)
	{
		printf("Unesi slovo:\t");
		scanf(" %c", &slovo);
		printf("\n");
		if (slovo == 'H')
			br_H++;
		if (slovo >= 'a' && slovo <= 'z')
			br_ms++;
	}

	printf("Slovo H uneseno je %d puta.\n", br_H);
	printf("Malo slovo uneseno je %d puta.\n", br_ms);
}
//5.
int main()
{
	int pass = 0, score = 0,cnt=0, i = 0; float avg = 0.0f;
	for (i = 0; i < 5; i++) {
		printf("Broj bodova:\t");
		scanf(" %d", &score);
		if (score < 0 || score > 100) {
			i--;
			continue;
		}
		if (score >= 50) {
			cnt++;
		}
		pass += score;
	}
		printf("Broj prolaznika: %d\n", cnt);
		avg = pass / 5.0f;
		printf("Prosjecan broj bodova: %f", avg);
}
int main()
{
	int arr[5] = { 0 };
	int i = 0, j = 0, temp = 0;

	printf("Unesi 5 brojeva:\n");
	for (i = 0; i < 5; i++) {
		scanf(" %d", &arr[i]);
	}
	for (i = 0; i < 4; i++) {
		for (j = i + 1; j < 5; j++) {
			if (arr[i] > arr[j]) {
				temp = arr[i];
				arr[i] = arr[j];
				arr[j] = temp;
			}
		}
	}
	printf("------------\n");
	for (i = 0; i < 5; i++) {
		printf("%d\n", arr[i]);
	}
}
//1.
int main()
{
	int value[2] = { 0 };
	char op = '\0';
	double result = 0.0;
	
	printf("Unesi prvi broj:\n");
	scanf(" %d", &value[0]);
	printf("Unesi drugi broj:\n");
	scanf(" %d", &value[1]);
	printf("Odaberi operaciju:\n + -> zbrajanje\n - -> oduzimanje\n * -> mnozenje\n / -> dijeljenje\n");
	scanf(" %c", &op);
 
	switch (op) {
	case '+':
		result = value[0] + value[1];
		break;
	case '-':
		result = value[0] + value[1];
		break;
	case '*':
		result = value[0] * value[1];
		break;
	case '/':
		if (value[1] == 0) {
			printf("Nije moguce dijelit s nulom!\n");
			result = INT_MIN;
		}
		else {
			result = (double)value[0] / value[1];
		}
		break;
	default:
		printf("Pogresan unos!\n");
		result = INT_MIN;
	}
	printf("------------\n");
	printf("Izvrsena operacija: %c\n", op);
	printf("Konacan rezultat: %lf\n", result);
}
//2.
int main()
{
	int ocjene[20] = { 0 }, i = 0;
	int histogram[5] = { 0 };
 
	printf("Potrebno je unijeti 20 ocjena.\n");
	for (i = 0; i < 20; i++) {
		printf("Ocjena broj %d.\t", i + 1);
		scanf(" %d", &ocjene[i]);
		if (ocjene[i] < 1 || ocjene[i] > 5) {
			printf("Neispravan unos!\n");
			i--;
		}
	}
	for (i = 0; i < 20; i++) {
		histogram[ocjene[i] - 1]++;
	}
	printf("------------\n");
	for (i = 0; i < 5; i++) {
		printf("Broj ocjena %d: %d\n", i + 1, histogram[i]);
	}
}
//3.
int main()
{
	int niz[10] = { 0 };
	int i=0, j = 0;
	int min = 0, max = 0;
	int temp = 0;
 
	printf("Unesi 10 brojeva:\n");
	for (i = 0; i < 10; i++) {
		printf("Broj %d:\t", i + 1);
		scanf(" %d", &niz[i]);
	}
	min = niz[0];
	max = niz[0];
	for (i = 1; i < 10; i++) {
		if (niz[i] < min) {
			min = niz[i];
		}
		if (niz[i] > max) {
			max = niz[i];
		}
	}
	for (i = 0; i < 9; i++) {
		for (j = i + 1; j < 10; j++) {
			if (niz[i] > niz[j]) {
				temp = niz[i];
				niz[i] = niz[j];
				niz[j] = temp;
			}
		}
	}
	printf("--------------\n");
	printf("Minimalni broj: %d\n Maksimalni broj: %d\n", min, max);
	for (i = 1; i < 10; i++) {
		printf("%d\n", niz[i]);
	}
}
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <conio.h>
#include <ctype.h>
#define STR_LEN 129
#define MAX_HEX_COUNT 30
#define _CRT_SECURE_NO_WARNINGS

//1.
int main()
{
	char znak = '\0';

	printf("Unesi znak:\t\n ESC za prekid.\n");
		do {
			znak = _getche();
		} while (znak != 27);
}
//2.
int main()
{
	char original[STR_LEN] = "\0", copy[STR_LEN] = "\0";
	int i = 0, j=0;

	printf("Unesi tekst:\n");
	scanf(" %s", original);

	for (i = 0; i < strlen(original); i++) {
		if (!isdigit(original[i])) {
			copy[j] = original[i];
			j++;
		}
	}
	copy[j] = '\0';
	printf("%s", copy);
}
//3.
int main()
{
	char txt[STR_LEN] = "\0";
	int i = 0, j = 0;
	char upper = '\0';

	printf("Unesi tekst:\t");
	scanf(" %s", txt);
	//a)
	for (i = 0; i < strlen(txt); i++) {
		if (isalpha(txt[i])) {
			txt[j++] = txt[i];
		}
	}
	txt[j] = '\0';
	printf("Nakon prve operacije: %s\n", txt);
	//b
	j = 0;
	for (i = 0; i < strlen(txt); i++) {
		switch (toupper(txt[i])) {
		case 'A':
		case 'E':
		case 'I':
		case 'O':
		case 'U':
			break;
		default:
			txt[j++] = txt[i];
		}
	}
	txt[j] = '\0';
	printf("Nakon druge operacije: %s\n", txt);
//c
	for (i = 0; i < strlen(txt); i++) {
		if (isupper(txt[i])) {
			txt[i] = tolower(txt[i]);
		}
		else {
			txt[i] = toupper(txt[i]);
		}
	}
	printf("Nakon trece operacije: %s\n", txt);
}

//4.
int main() {
	int decVal = 0, i=0, temp=0;
	char revhexVal[MAX_HEX_COUNT] = "\0", hexMap[]="0123456789ABCDEF";

	printf("Unesi dekadski broj:\t");
	scanf(" %d", &decVal);

	while (decVal != 0) {
		revhexVal[i++] = hexMap[decVal % 16];
		decVal /= 16;
	}
	i--;
	printf("Hex broj:\n");
	while (i >= 0) {
		printf("%c\n", revhexVal[i--]);
	}
}
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <conio.h>
#include <ctype.h>
#define STR_LEN 129
#define MAX_HEX_COUNT 30
#define _CRT_SECURE_NO_WARNINGS
#define MAT_SIZE 3

//1.
int main() {
	int A[MAT_SIZE][MAT_SIZE] = { 0 };
	int B[MAT_SIZE][MAT_SIZE] = { 0 };
	int i = 0, j = 0;

	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			printf("%dx%d:\t", i + 1, j + 1);
			scanf(" %d", &A[i][j]);
		}
	}
	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			B[i][j] = 5 * A[i][j];
		}
	}
	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			printf("%d ", B[i][j]);
		}
		printf("\n");
	}
}

//2.
int main() {
	int A[MAT_SIZE][MAT_SIZE] = { 0 };
	int B[MAT_SIZE][MAT_SIZE] = { 0 };
	int i = 0, j = 0;

	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			printf("%dx%d:\t", i + 1, j + 1);
			scanf(" %d", &A[i][j]);
		}
	}
	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			B[i][j] = A[j][i];
		}
	}
	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			printf("%d ", B[i][j]);
		}
		printf("\n");
	}
}

//3.
int main() {
	int A[MAT_SIZE][MAT_SIZE] = { 0 };
	int B[MAT_SIZE][MAT_SIZE] = { 0 };
	int C[MAT_SIZE][MAT_SIZE] = { 0 };
	int D[MAT_SIZE][MAT_SIZE] = { 0 };
	int i = 0, j = 0, temp=0, x=0;

	printf("Matrica A:\n");
	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			printf("%dx%d:\t", i + 1, j + 1);
			scanf(" %d", &A[i][j]);
		}
	}
	printf("Matrica B:\n");
	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			printf("%dx%d:\t", i + 1, j + 1);
			scanf(" %d", &B[i][j]);
		}
	}
	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			C[i][j] = A[i][j] + B[i][j];
		}
	}
	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			temp=0;
			for (x = 0; x < MAT_SIZE; x++) {
				temp += (A[i][x] * B[x][j]);
			}
			D[i][j] = temp;
		}
	}
	printf("Matrica D:\n");
	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			printf("%d ", D[i][j]);
		}
		printf("\n");
	}
}

//4.


#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define _CRT_SECURE_NO_WARNINGS
//1.
int main() {
	int cnt = 0, sum = 0, num = 0; float aritm = 0.0;
 
	do {
		printf("Unesi broj\t");
		scanf("%d", &num);
		if (num == 0) {
			break;
		}
		cnt++;
		sum += num;
	} while (1);
	aritm = (float)sum / cnt;
	printf("Aritmeticka sredina je %f.\n", aritm);
}
//2.
int main()
{
	int br = 0, rem = 0;
	printf("Unesi broj:\t");
	scanf(" %d", &br);
	if (br < 0) {
		printf("- ");
		br *= -1;
	}
	do {
		rem = br % 10;
		printf("%d ", rem);
		br /= 10;
	} while (br != 0);
}
//3.
int main()
{
	int rnd = 0, guess = 0, cnt = 0;
 
	srand((unsigned)time(NULL));
	rnd = rand();
	do {
		printf("Unesi broj:\t");
		scanf(" %d", &guess);
		cnt++;
		if (guess < rnd) {
			printf("Random broj je veci od unesenog!\n");
		}
		else if (guess > rnd) {
			printf("Random broj je manji od unesenog!\n");
		}
 
	} while (rnd != guess);
	printf("BINGO!\n");
	printf("Potrebno je bilo %d pokusaja.\n", cnt);
}

//4.
int main()
{
	int temp;
	for (int i = 1; i <= 100; i++)
	{
		temp = 1;
		for (int j = 2; j < i; j++)
		{
			if ((i % j) == 0)
				temp = 0;
		}
		if (temp)
			printf("%d ", i);
	}
}
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <conio.h>
#include <ctype.h>
#define MAT_SIZE 3
#define NAME_LEN 129
#define ARR_LEN 5

//1.
int main() {
	int A[MAT_SIZE][MAT_SIZE] = { 0 };
	int B[MAT_SIZE][MAT_SIZE] = { 0 };
	int i = 0, j = 0;

	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			printf("%dx%d:\t", i + 1, j + 1);
			scanf(" %d", &A[i][j]);
		}
	}

	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			B[i][j] = 5 * A[i][j];
		}
	}

	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			printf("%d ", B[i][j]);
		}
	}
	printf("\n");
}

//2.
int main() {
	int A[MAT_SIZE][MAT_SIZE] = { 0 };
	int B[MAT_SIZE][MAT_SIZE] = { 0 };
	int i = 0, j = 0;

	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			printf("%dx%d:\t", i + 1, j + 1);
			scanf(" %d", &A[i][j]);
		}
	}

	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			B[i][j] = 5 * A[j][i];
		}
	}

	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			printf("%d ", B[i][j]);
		}
	}
	printf("\n");
}
//3.
int main() {
	int A[MAT_SIZE][MAT_SIZE] = { 0 };
	int B[MAT_SIZE][MAT_SIZE] = { 0 };
	int C[MAT_SIZE][MAT_SIZE] = { 0 };
	int D[MAT_SIZE][MAT_SIZE] = { 0 };

	int i = 0, j = 0, temp = 0, x = 0;

	printf("Matrica A:\n");
	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			printf("%dx%d:\t", i + 1, j + 1);
			scanf(" %d", &A[i][j]);
		}
	}
	printf("Matrica B:\n");
	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			printf("%dx%d:\t", i + 1, j + 1);
			scanf(" %d", &B[i][j]);
		}
	}
	printf("Matrica C:\n");
	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			printf("%d ", C[i][j]);
		}
	}
	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			temp = 0;
			for (x = 0; x < MAT_SIZE; x++) {
				temp += (A[i][x] * B[x][j]);
			}
			D[i][j] = temp;
		}
	}

	printf("Matrica D:\n");
	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			printf("%d ", D[i][j]);
		}
	}
	printf("\n");
}
//4.
int main() {
	char names[ARR_LEN][NAME_LEN] = { "\0" };
	int i = 0, j = 0, temp = 0, firstIndex = 0, lastIndex = 0;
	char first[NAME_LEN] = { "\0" };
	char last[NAME_LEN] = { "\0" };

	for (i = 0; i < ARR_LEN; i++) {
		printf("Unesi ime osobe broj %d:\t", i + 1);
		scanf(" %s", names[i]);
	}

	firstIndex = 0;
	strcpy(first, names[0]);
	for (i = 1; i < ARR_LEN; i++) {
		if (_strcmpi(first, names[i]) > 0) {
			firstIndex = i;
			strcpy(first, names[i]);
		}
	}
	lastIndex = 0;
	strcpy(last, names[0]);
	for (i = 1; i < ARR_LEN; i++) {
		if (_strcmpi(last, names[i]) < 0) {
			lastIndex = i;
			strcpy(last, names[i]);
		}
	}
	printf("Prva osoba po abecedi je na indexu %d, ime je %s.\n", firstIndex, first);
	printf("Zadnja osoba po abecedi je na indexu %d, ime je %s.\n", lastIndex, last);
	
	for (i = 0; i < ARR_LEN - 1; i++) {
		for (j = i + 1; j < ARR_LEN; j++) {
			if (_strcmpi(names[i], names[j]) > 0) {
				strcpy(temp, names[i]);
				strcpy(names[i], names[j]);
				strcpy(names[j], temp);
			}
		}
	}
	printf("Sortirana imena:\n");
	for (i = 0; i < ARR_LEN; i++) {
		printf("%s\n", names[i]);
	}
}
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <conio.h>
#include <ctype.h>
#define MAT_SIZE 3
#define NAME_LEN 129
#define ARR_LEN 5

//1.
int main() {
	int A[MAT_SIZE][MAT_SIZE] = { 0 };
	int B[MAT_SIZE][MAT_SIZE] = { 0 };
	int i = 0, j = 0;

	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			printf("%dx%d:\t", i + 1, j + 1);
			scanf(" %d", &A[i][j]);
		}
	}

	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			B[i][j] = 5 * A[i][j];
		}
	}

	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			printf("%d ", B[i][j]);
		}
	}
	printf("\n");
}

//2.
int main() {
	int A[MAT_SIZE][MAT_SIZE] = { 0 };
	int B[MAT_SIZE][MAT_SIZE] = { 0 };
	int i = 0, j = 0;

	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			printf("%dx%d:\t", i + 1, j + 1);
			scanf(" %d", &A[i][j]);
		}
	}

	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			B[i][j] = 5 * A[j][i];
		}
	}

	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			printf("%d ", B[i][j]);
		}
	}
	printf("\n");
}
//3.
int main() {
	int A[MAT_SIZE][MAT_SIZE] = { 0 };
	int B[MAT_SIZE][MAT_SIZE] = { 0 };
	int C[MAT_SIZE][MAT_SIZE] = { 0 };
	int D[MAT_SIZE][MAT_SIZE] = { 0 };

	int i = 0, j = 0, temp = 0, x = 0;

	printf("Matrica A:\n");
	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			printf("%dx%d:\t", i + 1, j + 1);
			scanf(" %d", &A[i][j]);
		}
	}
	printf("Matrica B:\n");
	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			printf("%dx%d:\t", i + 1, j + 1);
			scanf(" %d", &B[i][j]);
		}
	}
	printf("Matrica C:\n");
	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			printf("%d ", C[i][j]);
		}
	}
	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			temp = 0;
			for (x = 0; x < MAT_SIZE; x++) {
				temp += (A[i][x] * B[x][j]);
			}
			D[i][j] = temp;
		}
	}

	printf("Matrica D:\n");
	for (i = 0; i < MAT_SIZE; i++) {
		for (j = 0; j < MAT_SIZE; j++) {
			printf("%d ", D[i][j]);
		}
	}
	printf("\n");
}
//4.
int main() {
	char names[ARR_LEN][NAME_LEN] = { "\0" };
	int i = 0, j = 0, temp = 0, firstIndex = 0, lastIndex = 0;
	char first[NAME_LEN] = { "\0" };
	char last[NAME_LEN] = { "\0" };

	for (i = 0; i < ARR_LEN; i++) {
		printf("Unesi ime osobe broj %d:\t", i + 1);
		scanf(" %s", names[i]);
	}

	firstIndex = 0;
	strcpy(first, names[0]);
	for (i = 1; i < ARR_LEN; i++) {
		if (_strcmpi(first, names[i]) > 0) {
			firstIndex = i;
			strcpy(first, names[i]);
		}
	}
	lastIndex = 0;
	strcpy(last, names[0]);
	for (i = 1; i < ARR_LEN; i++) {
		if (_strcmpi(last, names[i]) < 0) {
			lastIndex = i;
			strcpy(last, names[i]);
		}
	}
	printf("Prva osoba po abecedi je na indexu %d, ime je %s.\n", firstIndex, first);
	printf("Zadnja osoba po abecedi je na indexu %d, ime je %s.\n", lastIndex, last);
	
	for (i = 0; i < ARR_LEN - 1; i++) {
		for (j = i + 1; j < ARR_LEN; j++) {
			if (_strcmpi(names[i], names[j]) > 0) {
				strcpy(temp, names[i]);
				strcpy(names[i], names[j]);
				strcpy(names[j], temp);
			}
		}
	}
	printf("Sortirana imena:\n");
	for (i = 0; i < ARR_LEN; i++) {
		printf("%s\n", names[i]);
	}
}

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