Question

need help with calculating the sum from 1 to a number inputted by users, and output the sum. For example,
if user inputs 3, calculate 1+2+3 and output 6; if user inputs 5, calculate 1+2+3+4+5 and output
15; if user input 10, calculate 1+2+3+4+5+6+7+8+9+10 and output 55.

Answer 1

store the number in a variable and use a loop to sum up until you're done
print sum

Answer 2

here:

void main(void)
{
int i,n,s;

printf("type the number: ");
scanf("%d",&n);

s=n;

for(i=1;i<n;i++)
{
s=s+(n-i);
}

printf("the sum is: %d ",s);
}