add 2 numbers in c

1#include <stdio.h>
2int main() {    
3
4    int number1, number2, sum;
5    
6    printf("Enter two integers: ");
7    scanf("%d %d", &number1, &number2);
8
9    // calculating sum
10    sum = number1 + number2;      
11    
12    printf("%d + %d = %d", number1, number2, sum);
13    return 0;
14}
15

1int n,m;
2printf("%d",n+m);

1#include <stdio.h>
2int main() {    
3	int sum_tot = 0;
4    int num_1, num_2;    
5    printf("Please, Enter First integer: ");
6    scanf("%d", &num_1);
7    printf("\nNow Please, Enter Second integer: ");
8    scanf("%d", &num_2);
9
10    sum_tot = num_1 + num_2;      
11    
12    printf("\n%d + %d = %d", num_1, num_2, sum_tot);
13    return 0;
14}

1int num1,num2;
2printf("%d",num1+num2);

1#include<stdio.h>
2int main() {
3int a, b, sum;
4printf("\nEnter two no: ");
5scanf("%d %d", &a, &b);
6sum = a + b;
7printf("Sum : %d", sum);
8return(0);