C Primer Plus®, Third Edition

Debugging

Now that you can write a simple C program, you are in a position to make simple errors. Listing 2.4 presents a program with some errors. See how many you can spot.

Listing 2.4 The nogood.c program.

/* nogood.c -- a program with errors */ #include <stdio.h> int main(void) ( int n, int n2, int n3; /* this program has several errors n = 5; n2 = n * n; n3 = n2 * n2; printf(n = %d, n squared = %d, n cubed = %d\n", n, n2, n3) return 0; )

Syntax Errors

Listing 2.4 contains several syntax errors. You commit a syntax error when you don't follow C's rules. It's analogous to a grammatical error in English. For instance, consider the following sentence: Bugs frustrate be can. This sentence uses valid English words but doesn't follow the rules ...