args.c

#include <stdio.h>

int main(int argc, char *argv[])
{
	if (argc != 4) {
		printf("Usage: exe num1 opr num2\n");
		return 1;
	}
	int x = strtol(argv[1]);
	int y = strtol(argv[3]);
	int z = 0;
	if (strcmp(argv[2],"+") == 0 )
		z = x + y;
	else if (strcmp(argv[2], "-") == 0)
		z = x - y;
	else if (strcmp(argv[2], "*") == 0)
		z = x * y;
	else if (strcmp(argv[2], "/") == 0)
		z = x / y;
	printf("%d\n", z);
	return 0;
}