View Compilation Error

0_0_15455523_26296.c: In function 'main':
0_0_15455523_26296.c:18:5: error: 'return0' undeclared (first use in this function)
     return0;  
     ^
0_0_15455523_26296.c:18:5: note: each undeclared identifier is reported only once for each function it appears in