---------C 程序---------
000 小程序
//键入某一年月，输出此月有多少天
#include"stdio.h"
int main() {
int year, month, days;
printf("Please enter year and month:");
scanf("%d%d", &year, &month);
if (month < 1 || month > 12)
printf("Sorry,you put error date!");
else
switch(month) {
case 2: if (year%4==0&&year%100!=0) days=29;
else days=28; break;
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12: days=31; break;
case 4:
case 6:
case 9:
case 11: days=30; break;
}
printf("%d 年%d 月有%d 天", year, month, days);
}
000 小程序
/*求一元二次方程的根*/
#include"stdio.h"
#include"math.h"
int main () {
double a, b, c, s, x1, x2;
printf("Please input a,b,c:");
scanf("%lf%lf%lf", &a, &b, &c);
if (a >= (-1e-6) && a <= 1e-6)
printf("Sorry,you have a wrong number.");
else {
s = b * b - 4 * a * c;
if (s > 1e-6) {
/*计算两不等实根*/
x1 = (-b + sqrt(s)) / (2 * a);
x2 = (-b - sqrt(s)) / (2 * a);
printf("There are two different real:");
printf("x1=%9.3lf, x2=%9.3lf ", x1, x2);
} else if (s >= (-1e-6) && s <= (1e-6)) {
/*计算两相等实根*/
x1 = x2 = -b / (2 * a);
printf("There are two equal real: ");
printf("x1=%9.3lf, x2=%9.3lf ", x1, x2);
} else {
/*计算两不相等共轭复根*/
s = -s;
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