0_0_16355584_29518.cpp: In function 'int main()': 0_0_16355584_29518.cpp:9:18: error: redeclaration of 'int t' int a, b, c, s, t; ^ 0_0_16355584_29518.cpp:7:15: note: 'int t' previously declared here int i, j, k, t; ^