View Compilation Error

0_0_38139753_1030.cpp: In function 'int main()':
0_0_38139753_1030.cpp:5:24: error: 'm' was not declared in this scope
     while(~scanf("%d",&m)&&m){
                        ^
0_0_38139753_1030.cpp:8:25: error: 'a' was not declared in this scope
             scanf("%d",&a);
                         ^