Why does my string comparison fail?

Question

Let\'s say I have the following code and output:

for (j = 0; j <= i; j++) 
    printf(\"substring %d is %s\\n\", j, sub_str[j]);

Answer 1

You can't use == to compare strings in C. You must use strcmp.

for (j=0; j<=i; j++) { 
   if (strcmp(sub_str[j], "max_n=20") == 0) { 
      printf("substring %d is %s\n", j, sub_str[j]); 
   } 
}