Using argv and strcmp at C

Question

Im having some problem to use the strcmp function. Everytime I run this code, it just print the ERROR mensage, even if i use the correct argument at prompt.

if (strcmp(argv[1], "\?") == 0) {
    ajudaPrompt();
}else {
    printf ("ERROR.\n\n");
    system("pause");
}

Can someone help me?

Answer 1

The \\ character is used to begin an escape code in C strings. For example, \\n denotes a newline.

Since \\? is not a valid escape code, the backslash character is ignored. So the resulting string in the code is actually "?" .

If you want you string to contain a literal backslash, use two backslashes.

if (strcmp(argv[1], "\\?") == 0) {