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 Chapter 5Answers to Selected Exercises2. [was #2] (a)1
(b) 1
(c) 1
(d) 1
4. [was #4]
6. [was #12] Yes, the statement is legal. When 10. [was #16] The output is onetwo
since there are no Answers to Selected Programming Projects2. [was #6]
#include <stdio.h>
int main(void)
{
int hours, minutes;
printf("Enter a 24-hour time: ");
scanf("%d:%d", &hours, &minutes);
printf("Equivalent 12-hour time: ");
if (hours == 0)
printf("12:%.2d AM\n", minutes);
else if (hours < 12)
printf("%d:%.2d AM\n", hours, minutes);
else if (hours == 12)
printf("%d:%.2d PM\n", hours, minutes);
else
printf("%d:%.2d PM\n", hours - 12, minutes);
return 0;
}
4. [was #8; modified]
#include <stdio.h>
int main(void)
{
int speed;
printf("Enter a wind speed in knots: ");
scanf("%d", &speed);
if (speed < 1)
printf("Calm\n");
else if (speed <= 3)
printf("Light air\n");
else if (speed <= 27)
printf("Breeze\n");
else if (speed <= 47)
printf("Gale\n");
else if (speed <= 63)
printf("Storm\n");
else
printf("Hurricane\n");
return 0;
}
6. [was #10]
#include <stdio.h>
int main(void)
{
int check_digit, d, i1, i2, i3, i4, i5, j1, j2, j3, j4, j5,
first_sum, second_sum, total;
printf("Enter the first (single) digit: ");
scanf("%1d", &d);
printf("Enter first group of five digits: ");
scanf("%1d%1d%1d%1d%1d", &i1, &i2, &i3, &i4, &i5);
printf("Enter second group of five digits: ");
scanf("%1d%1d%1d%1d%1d", &j1, &j2, &j3, &j4, &j5);
printf("Enter the last (single) digit: ");
scanf("%1d", &check_digit);
first_sum = d + i2 + i4 + j1 + j3 + j5;
second_sum = i1 + i3 + i5 + j2 + j4;
total = 3 * first_sum + second_sum;
if (check_digit == 9 - ((total - 1) % 10))
printf("VALID\n");
else
printf("NOT VALID\n");
return 0;
}
10. [was #14]
#include <stdio.h>
int main(void)
{
int grade;
printf("Enter numerical grade: ");
scanf("%d", &grade);
if (grade < 0 || grade > 100) {
printf("Illegal grade\n");
return 0;
}
switch (grade / 10) {
case 10:
case 9: printf("Letter grade: A\n");
break;
case 8: printf("Letter grade: B\n");
break;
case 7: printf("Letter grade: C\n");
break;
case 6: printf("Letter grade: D\n");
break;
case 5:
case 4:
case 3:
case 2:
case 1:
case 0: printf("Letter grade: F\n");
break;
}
return 0;
}
Copyright © 2008, 1996 W. W. Norton & Company, Inc. All rights reserved. |