12)Three Address Code

 #include <stdio.h>
#include <string.h>

int tempVar = 1;

void newTemp(char *temp) {
    sprintf(temp, "t%d", tempVar++);
}
void replace(char expr[][10], int *n, int i, char *temp) {
    strcpy(expr[i - 1], temp);
    for (int j = i + 2; j < *n; j++)
        strcpy(expr[j - 2], expr[j]);
    *n -= 2;
}
void generateTAC(char input[]) {
    char lhs[10], rhs[100];
    int n = 0;
    // Split into lhs and rhs
    sscanf(input, "%[^=]=%s", lhs, rhs);
    char expr[50][10], temp[10];
    // Tokenize RHS
    for (int i = 0; rhs[i]; i++) {
        char t[2] = {rhs[i], '\0'};
        strcpy(expr[n++], t);
    }
    // First handle * and /
    for (int i = 0; i < n; i++)
        if (!strcmp(expr[i], "*") || !strcmp(expr[i], "/")) {
            newTemp(temp);
            printf("%s = %s %s %s\n", temp, expr[i - 1], expr[i], expr[i + 1]);
            replace(expr, &n, i, temp);
            i = -1;
        }
    // Then handle + and -
    for (int i = 0; i < n; i++)
        if (!strcmp(expr[i], "+") || !strcmp(expr[i], "-")) {
            newTemp(temp);
            printf("%s = %s %s %s\n", temp, expr[i - 1], expr[i], expr[i + 1]);
            replace(expr, &n, i, temp);
            i = -1;
        }
    // Final assignment
    printf("%s = %s\n", lhs, expr[0]);
}
int main() {
    char expr[100];
    printf("Enter expression (e.g., a=b+c*d): ");
    scanf("%s", expr);
    generateTAC(expr);
    return 0;
}