#include<stdio.h> //change negative number to positive number void change(float num1, float num2, float num3) { printf("changed: [%.1f] [%.1f] [%.1f]", num1 * -1, num2 * -1, num3 * -1); } void main() { float num1, num2, num3; printf("please enter negative numbers\n"); //check input data do { printf("enter number 1: "); scanf("%f", &num1); printf("enter number 2: "); scanf("%f", &num2); printf("enter number 3: "); scanf("%f", &num3); if(num1 >= 0 || num2 >= 0 || num3 >= 0) { printf("please enter negative numbers\n"); } }while(num1 >= 0); change(num1, num2, num3); }
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