Sum of first N numbers

Program:

 #include<stdio.h>
int add(int);
int main()
{
int n,ans;
printf("Enter n: ");
scanf("%d",&n);
ans=add(n);
printf("Sum : %d",ans);
    return 0;
}
int add(int m)
{
    int sum=0,i;
for(i=1;i<=m;i++)
{
sum=sum+i;
}
return sum;
}

Output:

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