Main.cc: In function ‘int gcd(int, int)’: Main.cc:5:9: error: ‘gcb’ was not declared in this scope return gcb(b,a%b); ^~~ Main.cc:5:9: note: suggested alternative: ‘gcd’ return gcb(b,a%b); ^~~ gcd Main.cc: In function ‘int main()’: Main.cc:11:8: error: ‘gcb’ was not declared in this scope int u=gcb(m,n); ^~~ Main.cc:11:8: note: suggested alternative: ‘gcd’ int u=gcb(m,n); ^~~ gcd