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C语言练习：使用for循环或while循环求前n个自然数的和

学究 0 Comments

1.For Loop

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#include <stdio.h>
int main()
{
    int n, count, sum = 0;
 
    printf("Enter the value of n(positive integer): ");
    scanf("%d",&n);
 
    for(count=1; count <= n; count++)
    {
        sum = sum + count;
    }
 
    printf("Sum of first %d natural numbers is: %d",n, sum);
 
    return 0;
}
Enter the value of n(positive integer): 100
Sum of first 100 natural numbers is: 5050

2.While Loop

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#include <stdio.h>
int main()
{
    int n, count, sum = 0;
 
    printf("Enter the value of n(positive integer): ");
    scanf("%d",&n);
 
    /* When you use while loop, you have to initialize the
     * loop counter variable before the loop and increment
     * or decrement it inside the body of loop like we did
     * for the variable "count"
     */
    count=1;
    while(count <= n){
        sum = sum + count;
        count++;
    }
 
    printf("Sum of first %d natural numbers is: %d",n, sum);
 
    return 0;
}
Enter the value of n(positive integer): 100
Sum of first 100 natural numbers is: 5050

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