C Program for Time Conversions Using If and ElseIf Statements

Problem

How to convert the time from 24 hr format to 12 hr format using C Programming language?

Solution

Read the time value from the user (at run time). It has to be converted into 12 hr format from 24 hr.

Algorithm

Start:
Step 1: Enter time in 24 hr format
Step 2: check the condition
      i. If(hour==0)
         Print min
     Ii. Elseif(hour<12)
          Print hour,min
    iii. Elseif(hour==12
         Print hour,min
     iv. Else
         Print hour % 12,min
Stop:

Program

 Live Demo

#include<stdio.h>
int main(){
   int hr,min;
   printf("enter the time in 24 hour format:");
   scanf("%d:%d",&hr,&min);
   printf("The 12 hr format time:");
   if(hr==0){
      printf("12:%.2d AM
",min);
   }
   else if(hr<12){
      printf("%d:%.2d AM
",hr,min);
   }
   else if(hr==12){
      printf("%d:%.2d PM
",hr,min);
   }
   else
      printf("%d:%.2d PM
",hr % 12,min);
   return 0;
}

Output

enter the time in 24 hour format:22:37
The 12 hr format time:10:37 PM