/* 4-1 */
int main(void)
{
char firstname[40];
char lastname[40];
printf("Usage : Firstname lastname\n");
printf("Please enter your name:");
scanf("%s %s", firstname, lastname);
//printf("Please enter your last name:");
//scanf("%s", lastname);
printf("%s,%s\n", lastname, firstname);
return 0;
}
/* 4-2 */
int main(void)
{
char first_name[40];
char last_name[40];
int first_name_length;
int last_name_length;
printf("Please enter your first name:");
scanf("%s", first_name);
printf("Please enter your last name:");
scanf("%s", last_name);
first_name_length = strlen(first_name);
last_name_length = strlen(last_name);
printf("a.\"%s,%s\"\n", last_name, first_name);
printf("b.\"%20s,%20s\"\n", last_name, first_name);
printf("c.\"%-20s,%-20s\"\n", last_name, first_name);
printf("d.\"%*s,%*s\"\n", last_name_length + 3, last_name, first_name_length + 3, first_name);
return 0;
}
/* 4-3 */
int main(void)
{
float num;
printf("Please enter a float number:");
scanf("%f", &num);
printf("a.输入%.1f或%e;\n", num, num);
printf("Please enter another float number:");
scanf("%f", &num);
printf("b.输入+%.3f或%e;\n", num, num);
return 0;
}
/* 4-4 */
int main(void)
{
char firstname[40];
char lastname[40];
float height;
printf("Pleass enter your name:<firstname lastname>");
scanf("%s %s", firstname, lastname);
printf("Please enter your height: (cm)\b\b\b\b\b\b\b\b\b\b");
scanf("%f", &height);
printf("%s %s, you are %.2f(m) tall.\n", firstname, lastname, height / 100);
return 0;
}
/* 4-5 */
int main(void)
{
float speed;
float byte;
float seconds;
printf("Please enter the download speed: (Mb/s)\b\b\b\b\b\b\b\b\b\b\b");
scanf("%f", &speed);
printf("Please enter the file size: (MB)\b\b\b\b\b\b\b\b\b");
scanf("%f", &byte);
seconds = (byte * 8) / speed;
printf("At %.2f megabits per seconds, a file of %.2f megabytes\n", speed, byte);
printf("download in %.2f seconds.\n", seconds);
return 0;
}
/* 4-6 */
int main(void)
{
char last_name[40];
char first_name[40];
int firstname_length;
int lastname_length;
printf("Please enter your last name:");
scanf("%s", last_name);
printf("Please enter your first name:");
scanf("%s", first_name);
firstname_length = strlen(first_name);
lastname_length = strlen(last_name);
printf("%s %s\n", last_name, first_name);
printf("%*d %*d\n", lastname_length, lastname_length, firstname_length, firstname_length);
printf("%s %s\n", last_name, first_name);
printf("%-*d %-*d\n", lastname_length, lastname_length, firstname_length, firstname_length);
return 0;
}
/* 4-7 */
int main(void)
{
double value1 = 1.0 / 3.0;
float value2 = 1.0/3.0;
printf("double variable: %.6f,float variable: %.6f\n", value1, value2);
printf("double variable: %.12f,float variable: %.12f\n", value1, value2);
printf("double variable: %.16f,float variable: %.16f\n", value1, value2);
printf("FLT_DIG: %d, DBL_DIG: %d", FLT_DIG, DBL_DIG);
return 0;
}
/* 4-8 */
#define LITRE_PER_GALLON (3.785)
#define KILOMETER_PER_MILE (1.609)
int main(void)
{
/* 输入旅行的里程和消耗的汽油量 */
float mile_distance;
float gas_consumption;
float kilometer_dist;
float litre_consump;
printf("How long have been travelled:");
scanf("%f", &mile_distance);
printf("How much gas have been used:");
scanf("%f", &gas_consumption);
litre_consump = gas_consumption * LITRE_PER_GALLON;
kilometer_dist = mile_distance * KILOMETER_PER_MILE;
printf("You can drive %.1f mile by using one gallon gas.\n", mile_distance / gas_consumption); /* 消耗单位燃料的行程 */
printf("You drive one kilometer will use %.1f litre gas.\n", litre_consump / kilometer_dist); /* 单位距离消耗的燃料 */
return 0;
}
《C Primer Plus》第六版第四章课后题
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转载自blog.csdn.net/weixin_41354745/article/details/82630884
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