Answer / Ratnesh Singh

In C, you can write a simple function to convert a 24-hour time format into a 12-hour AM/PM format. Here's an example:

```c
#include <stdio.h>

void hour_to_12(int hour) {
if (hour >= 0 && hour < 13)
printf("%d:00", hour);
else if (hour == 12)
printf("12:00");
else if (hour >= 13 && hour < 24) {
int new_hour = hour - 12;
printf("%d:00", new_hour);
}
}

int main() {
int hour, minute;

scanf("%d %d", &hour, &minute);
if (hour > 23 || hour < 0) {
printf("Invalid input. Please enter a valid 24-hour format time.n");
return 1;
}

hour_to_12(hour);
printf("%d:%02d", minute / 2, minute % 2 * 50);

return 0;
}
```

This program takes input in the format `HH MM` (Hours and Minutes) where HH is the hour in 24-hour format. The function `hour_to_12` converts the hour to a 12-hour AM/PM format, and the main function calculates and prints the minutes portion.

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