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C++ program to convert time from 12 hour to 24 hour format
This is a C++ program to convert time from 12 hour to 24 hour format.
Algorithm
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
Example
#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");
}
}Output
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
Updated on: 30-Jul-2019
821 Views
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