0_0_15711613_13285.cpp: In function 'int main()': 0_0_15711613_13285.cpp:7:10: error: redeclaration of 'int i' int a,e,i,o,u; ^ 0_0_15711613_13285.cpp:6:8: note: 'int i' previously declared here int n,i,l; ^