View Compilation Error

0_0_14157911_560.cpp:1:1: error: 'n' does not name a type
 n,m,i;
 ^
0_0_14157911_560.cpp: In function 'int main()':
0_0_14157911_560.cpp:4:26: error: 'n' was not declared in this scope
    while(scanf("%d%d\n",&n,&m),n)
                          ^
0_0_14157911_560.cpp:4:29: error: 'm' was not declared in this scope
    while(scanf("%d%d\n",&n,&m),n)
                             ^
0_0_14157911_560.cpp:4:30: error: 'scanf' was not declared in this scope
    while(scanf("%d%d\n",&n,&m),n)
                              ^
0_0_14157911_560.cpp:6:14: error: 'gets' was not declared in this scope
        gets(0);
              ^
0_0_14157911_560.cpp:7:16: error: 'puts' was not declared in this scope
        puts("0");
                ^