Hello
when I try to compile this code. my compiler show error message. I have mention code and error message. I think it s compiler error. I am using minGW
Code:
    #include<stdio.h>
    #include<conio.h>
    void main()
    {
    int a=10, b=20;
    int sum=0;
    clrscr();  // use clrscr() after variable declaration
    sum=a+b;
    printf("Sum: %d",s);
    getch();
    }
hello.c: In function 'main':
hello.c:7:5: warning: implicit declaration of function 'clrscr' [-Wimplicit-function-declaration]
clrscr(); // use clrscr() after variable declaration
^
hello.c:9:22: error: 's' undeclared (first use in this function)
printf("Sum: %d",s);
^
hello.c:9:22: note: each undeclared identifier is reported only once for each function it appears in

How to remove error