View Compilation Error

0_0_38241334_15266.cpp: In function 'int intmain()':
0_0_38241334_15266.cpp:7:1: error: 'doublen' was not declared in this scope
 doublen,m,i,sum;
 ^
0_0_38241334_15266.cpp:7:9: error: 'm' was not declared in this scope
 doublen,m,i,sum;
         ^
0_0_38241334_15266.cpp:7:11: error: 'i' was not declared in this scope
 doublen,m,i,sum;
           ^
0_0_38241334_15266.cpp:7:13: error: 'sum' was not declared in this scope
 doublen,m,i,sum;
             ^
0_0_38241334_15266.cpp:9:23: error: 'n' was not declared in this scope
 while(scanf("%lf%lf",&n,&m)!=EOF){
                       ^
0_0_38241334_15266.cpp:25:1: error: 'return0' was not declared in this scope
 return0;
 ^