Code:
#include stdio.h
void main()
{
int i, num, sum = 0;
printf("Enter an integer number \n");
scanf ("%d", &num);
for (i = 1; i <= num; i++)
{
sum = sum + i;
}
printf ("Sum of first %d natural numbers = %d\n", num, sum);
}
Output:
Enter an integer number
1300
Sum of first 1300 natural numbers = 845650
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