YoungProgrammer

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Problem 26: 
You are given two numbers, A and B, and you have to find the
total of all the numbers between these two numbers.For example
if you are given the numbers 9 and 15, you must find 
the sum 9+10+11+12+13+14+15 which is 84. 

#include<stdio.h>

int Solution_1(int n, int m) { // Using formula
    int total = m - n + 1;
    int sum = ((n + m) * total)/2;
    return sum;
}

int Solution_2(int n, int m) { // Using loop
    int i, sum = 0;
    for(i = n; i<=m; i++)  {
        sum+= i;
    }
    return sum;
}
int main() {
    int n, m;
    scanf("%d %d",&n,&m);
    printf("%d %d\n",Solution_1(n,m),Solution_2(n,m)); // both gives same answer
    return 0;
}

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