Question

I have a char pointer returned from a function, and i want to double check its value using the IF statement how should i implement this one in C.

substring function from here

I want it something like this

if (substring("xxxNameYYY",0,3)=="xxx"){
     //do this
} else {
     //do that
}

the above if statement always go to “do that” part.

thanks

Answer 1

You cannot compare string like that in C, you have to use strcmp(str1, str2) == 0 to check if they are equal.

In your case:

char * substr = substring("xxxNameYYY",0,3);
if (strcmp(substr, "xxx") == 0) {
    /* TODO */
}
else {
    /* TODO */
}