]$ gcc letsrock.c -o lala
letsrock.c: In function ‘main’:
letsrock.c:21: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘{’ token
letsrock.c:29: error: expected ‘{’ at end of input
letsrock.c:29: warning: return type of ‘main’ is not ‘int’