这个程序确定房间的面积，它是房间长度和宽度的乘积。房间是"太小"、"刚刚好"还是"太大"。如果房间"太小"或"太大"，则可用空间和所需空间之间的差，应为正数。
#include<stdio.h>
void main() {
// Declare variables and set initial values
int length, width, n, area, square;
// Print new values
printf("nEnter room length:");
scanf("%d", length);
printf("nEnter room width:");
scanf("%d", width);
printf("nEnter number of students:");
scanf("%d", n);
// assigning area
area = length * width;
printf("nArea is %dn", area);
square = area - n * 10;
if (area > n*10) {
printf("Room is too large by %d square feet", square);
}
else if (area < n*10) {
printf("Room is too small by %d square feet", square);
}
else {
printf("Room size is just right");
}
}
#include<stdio.h>
int main() {
// Declare variables and set initial values
int length, width, n, area, square;
// Print new values
printf("nEnter room length:");
scanf("%d", &length);
printf("nEnter room width:");
scanf("%d", &width);
printf("nEnter number of students:");
scanf("%d", &n);
// assigning area
area = length * width;
printf("nArea is %dn", area);
square = area - n * 10;
if (area > n*10) {
printf("Room is too large by %d square feet", square);
}
else if (area < n*10) {
printf("Room is too small by %d square feet", square);
}
else {
printf("Room size is just right");
}
return 0;
}`
扫描中变量前需要&运算符，以便将值存储在该变量中
例如scanf(%d,&b)
在格式说明符%d之后和变量之前使用&，因为&运算符用于获取变量的地址或获取用户输入，除了字符数组或字符串之外，在任何使用scanf的地方都可以使用。使用gets(variable_name)函数可以将字符数组或字符串作为用户的输入。例如，如果我接受你的程序，它应该是：
printf("nEnter room length:");
scanf("%d",&length);
printf("nEnter room width:");
scanf("%d",&width);
printf("nEnter number of students:");
scanf("%d",&n);
printf("n enter name : "); //datatype of Name must be String
gets(name);