How to write a c program to find the sum of all the triangler numbers between 1-100

Answer 1

Do you mean "triangular" numbers as follows:
1 + 2 + 3 + ........+ 100

If yes, you have to compute the Formula:
n * (n + 1) / 2.
for example you define a function that returns that value.

int triang(int num) {
return num * (num + 1) / 2;
}

After that you use it in main:

int main() {

int n;
printf("Enter a number: \n");
scanf("%d", &n);

printf("Result = %d", triang(n));

return 0;
}

You can also use a for loop in the function as follows:
int sum = 1
for (int n = 1; n <= 100; n++) {
sum += n;
return sum;
}

If you do not mean "triangular". Please explain!

Answer 2

No this is the correct way

Answer 3

This code dont give the summation

Answer 4

Of course that code gives the summation!!! I do not post something without checking it!!!!

You have to include <stdio.h>!!!!

--------------------------------------------------
#include <stdio.h>

int triang(int num) {
return num * (num + 1) / 2;
}

After that you use it in main:

int main() {

int n;
printf("Enter a number: \n");
scanf("%d", &n);

printf("Result = %d", triang(n));

return 0;
}

Answer 5

I will try again

Answer 6

Thank you for your anwser I had to add some little adjustment to it