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#include <stdio.h>
 
int main() 
{
	//int firstNumber, secondNumber, sumOfTwoNumbers;
 
    printf("11,12");
 
    // Two integers entered by user is stored using scanf() function
    scanf("%d %d", &firstNumber, &secondNumber);
 
    // sum of two numbers in stored in variable sumOfTwoNumbers
    sumOfTwoNumbers = firstNumber + secondNumber;
 
    // Displays sum      
    printf("%d + %d = %d", firstNumber, secondNumber, sumOfTwoNumbers);
 
	return 0;
}
 

prog.c: In function ‘main’:
prog.c:10:21: error: ‘firstNumber’ undeclared (first use in this function)
     scanf("%d %d", &firstNumber, &secondNumber);
                     ^~~~~~~~~~~
prog.c:10:21: note: each undeclared identifier is reported only once for each function it appears in
prog.c:10:35: error: ‘secondNumber’ undeclared (first use in this function)
     scanf("%d %d", &firstNumber, &secondNumber);
                                   ^~~~~~~~~~~~
prog.c:13:5: error: ‘sumOfTwoNumbers’ undeclared (first use in this function)
     sumOfTwoNumbers = firstNumber + secondNumber;
     ^~~~~~~~~~~~~~~

Standard output is empty