﻿ C Program: Display the sum of first 10 natural numbers - w3resource # C Exercises: Display the sum of first 10 natural numbers

## C For Loop: Exercise-2 with Solution

Write a C program to find the sum of first 10 natural numbers.

Pictorial Presentation: Sample Solution:

C Code:

``````#include <stdio.h>
int main()
{
int  j, sum = 0;

printf("The first 10 natural number is :\n");

for (j = 1; j <= 10; j++)
{
sum = sum + j;
printf("%d ",j);
}
printf("\nThe Sum is : %d\n", sum);
}
```
```

Sample Output:

```The first 10 natural number is :
1 2 3 4 5 6 7 8 9 10
The Sum is : 55
```

Flowchart: C Programming Code Editor:

Improve this sample solution and post your code through Disqus.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.

﻿

## C Programming: Tips of the Day

You are seeing the ffffff because char is signed on your system. In C, vararg functions such as printf will promote all integers smaller than int to int. Since char is an integer (8-bit signed integer in your case), your chars are being promoted to int via sign-extension.

Since c0 and 80 have a leading 1-bit (and are negative as an 8-bit integer), they are being sign-extended while the others in your sample don't.

```char    int
c0 -> ffffffc0
80 -> ffffff80
61 -> 00000061
```
Here's a solution:
```char ch = 0xC0;
printf("%x", ch & 0xff);
```

This will mask out the upper bits and keep only the lower 8 bits that you want.

Ref : https://bit.ly/3vOLizM