C语言怎么计算矩形的面积和周长

#include <stdio.h>

/* 长方形的高和宽，单位为米*/

int width;         

int height;        

int area;          

int perimeter;     

int main() {

    height = 7;

    width = 5;

    perimeter = 2*(height + width);

    printf("矩形的周长 = %d 米\n", perimeter);

    area = height * width;

    printf("矩形的面积 = %d 平方米\n", area);

return(0);

}