Sams Teach Yourself C in 21 Days

Understanding Variable Scope 303

12

9. What does the following program print? Don’t run the program—try to figure it
   out by reading the code.
   #include <stdio.h>
   void print_letter2(void); / function prototype /

int ctr;

char letter1 = ‘X’;

char letter2 = ‘=’;

int main( void )

{

for( ctr = 0; ctr < 10; ctr++ )

{

printf( “%c”, letter1 );

print_letter2();

}

return 0;

}

void print_letter2(void)

{

for( ctr = 0; ctr < 2; ctr++ )

printf( “%c”, letter2 );

}

10.BUG BUSTER:Will the preceding program run? If not, what’s the problem?

Rewrite it so that it is correct.

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