Lista 9 - Exercício 6

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

int sum(char* argv[]);
int subtract(char* argv[]);
int multiply(char* argv[]);
void divide(char* argv[]);

int main(int argc, char* argv[]){

    if (strcmp(argv[2],"+") == 0)
        printf("%d\n",sum(argv));
    else if (strcmp(argv[2],"-") == 0)
        printf("%d\n",subtract(argv));
    else if (strcmp(argv[2],"*") == 0)
        printf("%d\n",multiply(argv));
    else if (strcmp(argv[2],"/") == 0)
        divide(argv);
    return 0;
}

int sum(char* argv[]) {
    return atoi(argv[1]) + atoi(argv[3]);
}

int subtract(char* argv[]) {
    return atoi(argv[1]) - atoi(argv[3]);
}

int multiply(char* argv[]) {
    return atoi(argv[1]) * atoi(argv[3]);
}

void divide(char* argv[]) {
    if (atoi(argv[3]) == 0)
        printf("ERROR\n");
    else
        printf("%d\n", atoi(argv[1]) / atoi(argv[3]));
}