Main.cc: In function ‘int main()’:
Main.cc:17:11: warning: left operand of comma operator has no effect [-Wunused-value]
if (0 <= A,B <= 100 && 1 <= X,Y <= 100);
~~^~~~
Main.cc:17:25: warning: right operand of comma operator has no effect [-Wunused-value]
if (0 <= A,B <= 100 && 1 <= X,Y <= 100);
~~~~~~~~~^~~~~~~~~
Main.cc:17:5: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation]
if (0 <= A,B <= 100 && 1 <= X,Y <= 100);
^~
Main.cc:18:5: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the ‘if’
{
^
Main.cc:19:15: warning: unused variable ‘tongtien’ [-Wunused-variable]
float tongtien = A * X + B * Y;
^~~~~~~~
Main.cc:21:71: error: ‘tongtien’ was not declared in this scope
printf("tong so tien can mang theo de mua het tat ca la: %.2f\n", tongtien);
^~~~~~~~
Main.cc:10:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
scanf("%d", &A);
~~~~~^~~~~~~~~~
Main.cc:12:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
scanf("%d", &B);
~~~~~^~~~~~~~~~
Main.cc:14:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
scanf("%f", &X);
~~~~~^~~~~~~~~~
Main.cc:16:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
scanf("%f", &Y);
~~~~~^~~~~~~~~~