Unit Conversions Solution



#include <stdio.h>

main() {
  int seconds;
  int minutes;
  int hours;
  int days;

  printf("Enter the number of seconds: ");
  scanf("%d", &seconds);
  minutes = seconds / 60;
  hours = (seconds / 60) / 60;
  days = ((seconds / 60) / 60) / 24;
  printf("%d seconds = %d minute(s)\n", seconds, minutes);
  printf("%d seconds = %d hour(s)\n", seconds, hours);
  printf("%d seconds = %d day(s)\n", seconds, days);
}

Discussion


int seconds; Declares an integer variable seconds. In most systems the range will be between -2 billion and 2 billion.
int minutes; Declares an integer variable minutes.
int hours; Declares an integer variable hours.
int days; Declares an integer variable days.
printf("Enter the number of seconds: "); Print a message to the screen asking the user for an integer number of seconds.
scanf("%d", &seconds); The scanf function gets inputs from the standard input device and writes the values into the variables indicated. In this case, the %d specifies that an integer is to be read into the variable seconds. The ampersand (&) in front of the variable indicates that the address is passed into the scanf function so that the scanf function knows where to write the data to.
minutes = seconds / 60; Calculate the number of minutes with simple arithmetic. Note that any remainder is truncated.
hours = (seconds / 60) / 60; Calculate the number of hours with simple arithmetic. Note that any remainder is truncated.
days = ((seconds / 60) / 60) / 24; Calculate the number of days with simple arithmetic. Note that any remainder is truncated.
printf("%d seconds = %d minute(s)\n", seconds, minutes); Print the number of seconds and the converted number of minutes. The %d's are print masks for the two integers which are specified as the second and third parameters passed to the printf function.

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Updated November 24, 2005. For comments and questions, send email to Vector.x64 @ gmail.com (without the spaces).