求三个数中最大数的 C 程序
要理解此示例,您应该具备以下 C 语言编程主题的知识:
示例 1:使用 if 语句
#include <stdio.h>
int main() {
double n1, n2, n3;
printf("Enter three different numbers: ");
scanf("%lf %lf %lf", &n1, &n2, &n3);
// if n1 is greater than both n2 and n3, n1 is the largest
if (n1 >= n2 && n1 >= n3)
printf("%.2f is the largest number.", n1);
// if n2 is greater than both n1 and n3, n2 is the largest
if (n2 >= n1 && n2 >= n3)
printf("%.2f is the largest number.", n2);
// if n3 is greater than both n1 and n2, n3 is the largest
if (n3 >= n1 && n3 >= n2)
printf("%.2f is the largest number.", n3);
return 0;
}
示例 2:使用 if…else
#include <stdio.h>
int main() {
double n1, n2, n3;
printf("Enter three numbers: ");
scanf("%lf %lf %lf", &n1, &n2, &n3);
// if n1 is greater than both n2 and n3, n1 is the largest
if (n1 >= n2 && n1 >= n3)
printf("%.2lf is the largest number.", n1);
// if n2 is greater than both n1 and n3, n2 is the largest
else if (n2 >= n1 && n2 >= n3)
printf("%.2lf is the largest number.", n2);
// if both above conditions are false, n3 is the largest
else
printf("%.2lf is the largest number.", n3);
return 0;
}
示例 3:使用嵌套 if…else
#include <stdio.h>
int main() {
double n1, n2, n3;
printf("Enter three numbers: ");
scanf("%lf %lf %lf", &n1, &n2, &n3);
if (n1 >= n2) {
if (n1 >= n3)
printf("%.2lf is the largest number.", n1);
else
printf("%.2lf is the largest number.", n3);
} else {
if (n2 >= n3)
printf("%.2lf is the largest number.", n2);
else
printf("%.2lf is the largest number.", n3);
}
return 0;
}
上面所有这些程序的输出都是一样的。
Enter three numbers: -4.5
3.9
5.6
5.60 is the largest number.