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法律研究C++ 程序将时间从 12 小时格式转换为 24 小时格式
这是一个 C++ 程序，用于将时间从 12 小时格式转换为 24 小时格式。
算法
Begin In main(), If median = pm Check if entered hours is less than 12 Then add 12 to hours and print the time in 24 hours format. Check if entered hours is equal to 12 Then print “00” as hours and print the time in 24 hours format. Else If median=am Check if entered hours is less than 12 Then print the time in 24 hours format. Check if entered hours is equal to 12 Then print “12” as hours and print the time in 24 hours format. Else print wrong choice. End
范例
#include<iostream>
#include<string.h>
#include <iomanip>
using namespace std;
int main() {
int hours,minutes,seconds,h1,m1,s1;
char median[10];
cout<<"Enter hours, minutes, seconds:";
cin>>hours;
cin>>minutes;
cin>>seconds;
cout<<"Enter median:";
cin>>median;
cout<<"Time in 12 hour format:"<<setfill('0') << setw(2) <<hours<<":"<<setfill('0') << setw(2)
<<minutes<<":"<<setfill('0') << setw(2) <<seconds<<median<<endl; //setw()=sets the field width,
//setfill()=set character as the streams fill character.
if(strcmp(median,"pm")==0) { //compare the strings "0" is for true "1" is for false.
if (hours<12) {
h1=hours+12;
m1=minutes;
s1=seconds;
cout<<"Time in 24 hour format:" <<h1<<":"<<setfill('0') << setw(2) <<m1<<":"<<setfill('0') << setw(2) <<s1<<median;
} else if(hours=12) {
h1=12;
m1=minutes;
s1=seconds;
cout<<"Time in 24 hour format:"<<h1<<":"<<setfill('0') << setw(2) <<m1<<":"<<setfill('0') << setw(2) <<s1<<median;
}
} else if(strcmp(median,"am")==0) {
if (hours<12) {
h1=hours;
m1=minutes;
s1=seconds;
cout<<"Time in 24 hour format:"<<setfill('0') << setw(2) <<h1<<":"<<setfill('0') << setw(2) <<m1<<":"<<setfill('0') << setw(2) <<s1<<median;
} else if(hours=12) {
m1=minutes;
s1=seconds;
cout<<"Time in 24 hour format:"<<"00"<<":"<<setfill('0') << setw(2) <<m1<<":"<<setfill('0') << setw(2) <<s1<<median;
}
} else {
printf("Wrong choice");
}
}输出
Enter hours, minutes, seconds:12 07 06 Enter median:pm Time in 12 hour format:12:07:06pm Time in 24 hour format:12:07:06pm Enter hours, minutes, seconds:01 02 30 Enter median:pm Time in 12 hour format:01:02:30pm Time in 24 hour format:13:2:30pm Enter hours, minutes, seconds:10 10 03 Enter median:am Time in 12 hour format:10:10:03am Time in 24 hour format:10:10:03am Enter hours, minutes, seconds:12 02 04 Enter median:am Time in 12 hour format:12:02:04am Time in 24 hour format:00:02:04am
更新于：2019 年 7 月 30 日
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