C程序 查找矩形面积和周长

在这里，我们将用C语言程序求出长方形的面积和周长，如下所示。

示例:

输入:

l = 10 
b = 10 

输出:

area = 100 
perimeter = 40 

解释一下。

长方形的面积公式为

Area = length*breadth => l*b 

长方形的周长公式为

Perimeter = 2*(length + breadth) => 2*(l+b) 

方法 1:

// C program to demonstrate the
// area and perimeter of rectangle
#include <stdio.h>
 
int main()
{
 
    int l = 10, b = 10;
    printf("Area of rectangle is : %d", l * b);
    printf("\nPerimeter of rectangle is : %d", 2 * (l + b));
    return 0;
}

输出

Area of rectangle is : 100
Perimeter of rectangle is : 40

方法 2:

// C program to demonstrate the
// area and perimeter of rectangle
#include <stdio.h>
 
int main()
{
 
    int l = 10, b = 10;
    int A, P;
    A = l * b;
    P = 2 * (l + b);
    printf("Area of rectangle is : %d", A);
    printf("\nPerimeter of rectangle is : %d", P);
    return 0;
}

输出

Area of rectangle is : 100
Perimeter of rectangle is : 40

方法3：使用函数

// C program to demonstrate the
// area and perimeter of rectangle
// using function
#include <stdio.h>
 
int area(int a, int b)
{
    int A;
    A = a * b;
    return A;
}
int perimeter(int a, int b)
{
    int P;
    P = 2 * (a + b);
    return P;
}
 
int main()
{
 
    int l = 10, b = 10;
    printf("Area of rectangle is : %d", area(l, b));
    printf("\nPerimeter of rectangle is : %d",
           perimeter(l, b));
    return 0;
}

输出

Area of rectangle is : 100
Perimeter of rectangle is : 40