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[Geekibz]

Wsp c people.code below's supposed to printout the sum of all integers less than and including the limit specified by user.Something's missing or wrong_ I jus can't figure out what, pls help.

#include<stdio.h>
main ()

{
int limit,i,sum;
printf("Input limit:");
scanf("%d",&limit);
for(i=limit;i>0;i--)
sum=sum+i;
printf("%d\n",sum);
}

[Simonius]

I'd change it to:

#include <stdio.h>
 
int main(){
int limit, i, sum=0;
 
printf("Input limit: ");
scanf("%d",&limit);
 
for(i=0;i<=limit;i++)
          sum+=i;
 
printf("\nResult: %d",sum);
 
return 0;
 

It's a good habit to initialise what you're going to use.

[Laharl]

Yup. By not initializing, you make sum's initial value the same as whatever last used the block of memory it got allocated, which if you're incredibly lucky, might actually be zero. Most likely, though, it'll be some kind of garbage data. Always, always, always, initialize before you use.

[NorseMN]

Just an FYI,
You don't need a loop to do this.
The sum of all positive integers from 1 through N is given by N * (N + 1) / 2.
Of course, you probably already know this and are just practicing your coding.

[sicarie]

Laharl-

Please check your Private Messages, which are accessible through the PMs link in the top right corner of the page.

Thanks,

sicarie