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View Compilation Error

0_0_14011214_9524.cpp:8:11: error: '::main' must return 'int'
 void main(){
           ^
0_0_14011214_9524.cpp: In function 'int main()':
0_0_14011214_9524.cpp:15:10: error: expected primary-expression before '%' token
 if(scanf(%lf),&a)==3.1312){
          ^
0_0_14011214_9524.cpp:15:11: error: 'lf' was not declared in this scope
 if(scanf(%lf),&a)==3.1312){
           ^
0_0_14011214_9524.cpp:15:18: error: expected primary-expression before '==' token
 if(scanf(%lf),&a)==3.1312){
                  ^
0_0_14011214_9524.cpp:19:10: error: expected primary-expression before '%' token
 if(scanf(%lf),&a)==3.1415){
          ^
0_0_14011214_9524.cpp:19:11: error: 'lf' was not declared in this scope
 if(scanf(%lf),&a)==3.1415){
           ^
0_0_14011214_9524.cpp:19:18: error: expected primary-expression before '==' token
 if(scanf(%lf),&a)==3.1415){
                  ^
0_0_14011214_9524.cpp:22:10: error: expected primary-expression before '%' token
 if(scanf(%lf),&a)==0.3){
          ^
0_0_14011214_9524.cpp:22:11: error: 'lf' was not declared in this scope
 if(scanf(%lf),&a)==0.3){
           ^
0_0_14011214_9524.cpp:22:18: error: expected primary-expression before '==' token
 if(scanf(%lf),&a)==0.3){
                  ^


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