Sum of all the numbes upto a given number using C.

 Program :

#include<stdio.h>
#include<conio.h>
void main()
{ int i,initial_value,final_value,sum=0;
clrscr();
printf("Enter the initial value:\n");
scanf("%d",&initial_value);
printf("Enter the final value:\n");
scanf("%d",&final_value);
for(i=initial_value;i<=final_value;i++)
{
sum=sum+i;
}
printf("Sum is %d\t",sum);
getch();
}

Output :



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