0_0_30493449_17007.cpp: In function 'int main()': 0_0_30493449_17007.cpp:9:5: error: 'cin' was not declared in this scope cin >> ca; ^ 0_0_30493449_17007.cpp:12:12: error: 'FU' was not declared in this scope FU(i,n) cin>>a[i]; ^