Write a program in C to display the first n natural numbers and then print their sum, where the value of n will be supplied by the user.

 /*This program is to get sum of all natural numbers till the user input*/

#include <stdio.h>

#include <conio.h>

int main()

{

int n, i, sum;

printf("Enter a natural number: ");

scanf("%d", &n);

printf("All nautral numbers till %d are:\n", n);

for (i = 0; i <= n; i++)

{

// strcat(strn, i);

// char * __cdecl strcat(char * __restrict__ strn,const char * __restrict__ i);

printf("%d ", i);

if (!(i%5))

{

printf("\n");

}

sum+=i;

}

printf("\nSum of all natural numbers till %d is: %d \n", n, sum);

getch();

return 0;

}