Simple calculator in C, Only the multiplication operator doesn't work [duplicate]

Question

I've started to learn C and in the chapter on "user input" there is an example calculator simply using command-line arguments. When I wrote and compiled it on my own machine, all the operators (-, +, /) except the multiplication (*) operator worked. When trying to multiply it just displays the command prompt on a new line. Any reason for this? Could the example be wrong? Here it is:

#include <stdio.h> int main (int argc, char *argv[]) { int arg1, arg2; if (argc == 4) { sscanf (argv[1], "%d", &arg1); sscanf (argv[3], "%d", &arg2); if (*argv[2] == '+') printf ("%d\n", arg1 + arg2); if (*argv[2] == '-') printf ("%d\n", arg1 - arg2); if (*argv[2] == '*') printf ("%d\n", arg1 * arg2); if (*argv[2] == '/') printf ("%d\n", arg1 / arg2); } return 0; }

Ahh, this is a Windows versus Linux problem. Use ./a.out 2 \* 3 to prevent the * being expanded to all the files in the current directory. — Ken Y-N
– Ken Y-N, Commented Jan 5, 2017 at 6:04

Abbas · Accepted Answer · 2017-01-05 06:05:04Z

You need to use \ before * if you are using a Unix Shell otherwise The shell will understand it as a wild card character.

$ ./yourapp 1 \* 1 1

good luck and happy coding :)

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