C primer 编程练习 (不断更新)

目前在看《C Primer》,以后会经常在这篇博客里更新课后的编程练习题

第二章：编程练习

2.1

#include <stdio.h>

int main(void)
{
printf("Anton Bruckner\n");
printf("Anton\nBruckner\n");
printf("Anton");
printf("Bruckner");
return 0;
}

2.2

#include <stdio.h>

int main(void)
{
	printf("姓名：霍义霞\n");
	printf("地址：北京电子科技学院\n");

return 0;
}

2.3

#include <stdio.h>

int main(void)
{
	int age;
	int days;
	age = 24;
	days = age*365;
	printf("my age is %d,that is %d days\n",age,days);

	return 0;
}

2.4

#include <stdio.h>
void jolly(void);
void fellow(void);

int main(void)
{
	jolly();
	fellow();

	return 0;
}

void jolly(void)
{
	printf("For he's a jolly good fellow!\nFor he's a jolly good fellow!\nFor he's a jolly good fellow!\n");
}
void fellow(void)
{
	printf("which nobody can deny\n");
}

2.5

#include <stdio.h>

int main(void)
{
	int toes=10;
	int toes_double;
	int toes_square;
	toes_double=toes+toes;
	toes_square=toes*toes;
	printf("toes=%d,toes_double=%d,toes_square=%d\n",toes,toes_double,toes_square);

	return 0;
}

2.6

#include <stdio.h>
void smile_one(void);

int main(void)
{
	printf("smile!smile!smile!\n");
	printf("smile!smile!\n");
	smile_one();

	return 0;
}
void smile_one(void)
{
	printf("smile!\n");
}

2.7

#include <stdio.h>
void one();
void two();
void three();

int main(void)
{
	printf("starting now:\n");
	one();
	two();
	three();
	printf("done\n");

	return 0;
}

void one()
{
	printf("one\n");

}
void two()
{
	printf("two\n");
}
void three()
{
	printf("three\n");
}

第三章 编程练习

3.1

#include<stdio.h>
int main(void)  /*本机使用的是32位系统 */
{ 

	int i=2147483647;
	float f_up=1.234567e38;
	float f_down=1.234567;
	printf("%d\n",i+1); //有符号整型最大表示 2147483647,故溢出
	printf("%f\n",f_up*10); //单精度浮点数最大指数为38，故上溢出
	printf("%f\n",f_down/10); //单精度浮点保留6位有效数字，故下溢出
	return 0;
}

3.2

#include<stdio.h>
int main(void)  /*ASCII码和字符的转换*/

{
	char a;/*保证输入的只有8位*/
	printf("Please enter an ASCII number between 0-127:");
	scanf("%d",&a);
	printf("the ASCII number means:%c\n",a);

	return 0;
}

3.3

#include<stdio.h>

int main(void)
{
	printf("\aStartked by the sudden,Sally shouted,\"By the Gteat Pumpkin,what was that!\"\n" );
	return 0;
}

3.4

#include<stdio.h>

int main(void)
{
	float a;
	printf("please input a float number:");
	scanf("%f",&a);
	printf("the input is %f or %e\n",a,a);
	return 0;
}

3.5

#include<stdio.h>

int main(void)
{
	int a = 3.156e7;
	int age;
	printf("please input your age:");
	scanf("%d",&age);
	printf("the age is %d,that is %e seconds\n",age,age*a);
	return 0;
}

3.6

#include<stdio.h>
int main()
{
float k;
printf("Please input the weight:");
scanf("%f",&k);
printf("It includes %e molecules\n",k*950/3.0e-23);

}

3.7

#include<stdio.h>

int main()
{
		float height;
		printf("Please input your height(cm):");
		scanf("%f",&height);
		printf("Your height is:%f(inch)\n",height/2.54);
}

第四章 编程练习

4.1

#include <stdio.h>

int main()
{
	char f_name[20],l_name[20];
	printf("please input your first name and last name:");
	scanf("%s %s",f_name,l_name);
	printf("%s,%s\n",l_name,f_name);

	return 0;
}

4.2

#include <stdio.h>

int main()
{
	char name[40];
	printf("please input your name:");
	scanf("%s",name);
	printf("\"%s\"\n",name);
	printf("\"%20s\"\n",name);
	printf("\"%-20s\"\n",name);
	printf("\"%s   \"\n",name);
	return 0;
}

4.3

#include <stdio.h>

int main()
{
	float a = 21.29;
	printf("the input is %.1f or %0.1e\n",a,a);
	printf("the input is +%.3f or %0.3E\n",a,a);

	return 0;
}

4.4

#include<stdio.h>
int main() //
{
	char name[20];
	float height;
	printf("please input your height(inch) and your name:");
	scanf("%f %s",&height,name);
	printf("%s,you are %.3f feet tall\n",name,height);
	printf("please input your height(cm) and your name:");
	scanf("%f %s",&height,name);
	printf("%s,you are %.3f meters tall\n",name,height/100);
	return 0;
}

4.5

#include<stdio.h>
#include "string.h"
int main() //对齐稍有难度，要用到*，*代表宽度，可参考课本p81
{
	char f_name[20];
	char l_name[20];
	short f,l;
	printf("please input your  first name and last name:");
	scanf("%s %s",f_name,l_name);
	printf("%s %s\n",f_name,l_name);
	f = strlen(f_name);
	l = strlen(l_name);
	printf("%*d %*d\n",f,f,l,l);
	return 0;
}

4.6

#include<stdio.h>
#include <float.h>
int main()
{
	double a = 1.0/3.0;
	float  b = 1.0/3.0;
	printf("%.4f %.4f\n",a,b);
	printf("%.12f %.12f\n",a,b);
	printf("%.16f %.16f\n",a,b);
	printf("%f %lf\n",FLT_DIG,DBL_DIG);
	return 0;
}

4.7

#include<stdio.h>
#define GALLON_LITRE 3.785
#define MILE_KILOMETRE 1.609
int main()
{
float m,g;
printf("Please input the miles and gallons:");
scanf("%f%f",&m,&g);
printf("That is %f miles/gallon\n",m/g);
printf("That is %f litres/hkm\n",GALLON_LITRE *g/(MILE_KILOMETRE *m*100));
}

第五章编程练习

5.1

#include <stdio.h>
#define H_PER_M 60
int main()
{
	long minutes;
	long  hours;
	printf("please input the current_time in minutes:");
	scanf("%ld",&minutes);
	while(minutes > 0)
	{
		hours = minutes / H_PER_M;
		minutes = minutes % H_PER_M;
		printf("that time is %ld hours and %ld minutes\n",hours,minutes);
		printf("again:");
		scanf("%ld\n",&minutes);

	}

	return 0;
}

5.2

#include <stdio.h>
int main()
{
	int a;
	int i =10;
	printf("please input the number:");
	scanf("%d",&a);
	while (i--)
		printf("%3d",a++);
		printf("%3d\n",a);
	return 0;
}

5.3

#include <stdio.h>
#define week 7
int main()
{
	int days1;
	int days;
	int weeks;
	printf("please input the days:");
	scanf("%d",&days);
	while (days > 0)
	{
		weeks = days/week;
		days1 = days % week;
		printf("%d days is %d weeks , %d days\n",days,weeks,days1);
		printf("input again:");
		scanf("%d",&days);
	}
	return 0;
}

5.4

#include<stdio.h>
#define INCHES_PER_FEET 12
#define INCHES_PER_CM 0.393700
int main()
{
	float centimeters,inches;
	long feet;
	printf("please input  a height in centimeters:");
	scanf("%f",&centimeters);
	while(centimeters>0)
	{
		inches=centimeters*INCHES_PER_CM;
		feet=inches/INCHES_PER_FEET;
		inches=inches-feet*INCHES_PER_FEET;
		printf("%.1f cm = %ld feet, %.1f inches\n",centimeters,feet,inches);
		printf("Enter a height in centimeters(<=0 to quit):");
		scanf("%f",&centimeters);
	}
	printf("Bye\n");
	return 0;
}

5.5

#include<stdio.h>
int main()
{
	int count,i = 10,sum;
	printf("please input 20 integer:\n");
	while(i--)
	{
		scanf("%d",&count);
		sum+=count;
	}
	printf("the sum of the 20 count is : %d\n",sum);
	return 0;
}

5.6

#include<stdio.h>
int main()
{
	int count,i = 10,sum;
	printf("please input 20 integer:\n");
	while(i--)
	{
		scanf("%d",&count);
		count=count*count;
		sum+=count;
	}
	printf("the sum of the 20 count is : %d\n",sum);
	return 0;
}

5.7

#include<stdio.h>
void cube(float);
int main()
{
	float a;
	printf("please input a float:");
	scanf("%f",&a);
	cube(a);
	return 0;
}
	void cube(float n)
	{
		printf("the number's cube is %f\n",n*n*n);
	}

5.8

#include<stdio.h>
void Temperatures(double);
int main()
{
	double fahrenheit;

	printf("please input the temperatures(fahrenheit)");
	while(scanf("%lf",&fahrenheit))
	{
		Temperatures(fahrenheit);
		printf("input again:");

	}
	 return 0;
}
	void Temperatures(double fahrenheit )
	{
		double celsius;
		double kelvin;
		double C_F_MULT = 1.8;
		double C_F_PLUS = 32.0;
		double K_C_PLUS = 273.16;
		celsius = C_F_MULT*fahrenheit +C_F_PLUS;
		kelvin =  celsius + K_C_PLUS;
		printf("%.2lf fahrenheit is %.2lf celsius or %.2lf kelvin\n",fahrenheit,celsius,kelvin);
	}

第六章 编程练习

6.1

#include<stdio.h>
int main()
{
	int i = 0;
	char c ='a';
	char letter[26];
	printf("please input the 26 letters:");
	while(c <= 'z')
	{
		letter[i] = c;
		printf("%c ",c);
		i++;
		c++;
	}
	printf("\n");
	return 0;
}

6.2

#include<stdio.h>

int main()
{
	int i,j;
	char c = '$';
	for (i=0;i< 5;i++)
	{
		for (j=0;j < i+1;j++)
		{
			printf("%c",c);
		}
		printf("\n");
	}
	return 0;
}

6.3

#include<stdio.h>
int main()
{
	int i,j;
	char c = 'F';
	for (i=0;i<6;i++)
	{
		for (j=0;j<i+1;j++)
		{
			printf("%c",'F'-j);
		}
		printf("\n");
	}
	return 0;
}

6.4

#include<stdio.h>
int main()
{
	char letter;
	int i,space,up,down;
	printf("please input a capital letter:");
	scanf("%c",&letter);
	for (i=0;i<=letter-'A';i++)
	{
		for (space='A';space<letter-i;space++)
		{
			printf(" ");
		}
		for (up='A';up<='A'+i;up++)
		{
			printf("%c",up);
		}
		for (down=up-2;down>='A';down--)
		{
			printf("%c",down);
		}
		printf("\n");
	}
	return 0;
}

6.5

#include<stdio.h>
int main()
{
	int up_limit;
	int down_limit;
	int square,cube;
	printf("enter the down_limitand up_limit:");
	scanf("%d %d",&down_limit,&up_limit);
	if (down_limit>up_limit)
	{
		printf("error:\n");
	}
	else
	{
		for (;down_limit<=up_limit;down_limit++)
		{
			square = down_limit*down_limit;
			cube=square*down_limit;
			printf("%6d%6d%6d\n",down_limit,square,cube);
		}
	}

	return 0;
}

6.6

#include<stdio.h>
#include <string.h>
int main()
{
	char word[20];
	int n;
	printf("Enter a word:\n");
	scanf("%s",&word);
	n = strlen(word);
	for (int i=n-1;i>=0;i--)
	{
		printf("%c",word[i]);
	}
	printf("\n");
	return 0;
}

6.7

#include<stdio.h>
int main()
{
	float a,b;
	printf("please input two float numbers:");
	while (scanf("%f%f",&a,&b)==2)
	{
		printf("%f\n",(a-b)/(a*b));
		printf("input again\n");
	}

	return 0;
}

6.8

#include<stdio.h>
float test(float,float);
int main()
{
	float first,second;
	printf("please input two float numbers:");
	while (scanf("%f%f",&first,&second)==2)
	{
		printf("%f\n",test(first,second));
		printf("input again\n");
	}
	return 0;
}
float test(float f,float s)
{
	return (f-s)/(f*s);
}

6.9

#include<stdio.h>
int main() //用循环求平方的和
{
	int super,lower,sum;
	printf("Enter lower and upper integer limits:");
	scanf("%d%d",&lower,&super);
	while(lower<super)
	{
		for(int i=lower;i<=super;i++)
			sum+=i*i;
		printf("The sums of the squares "
			"from %d to %d is %d\n",lower*lower,super*super,sum);
		sum=0;
		printf("Enter next set of limits:");
		scanf("%d%d",&lower,&super);
	}
	printf("Done\n");
	return 0;
}

6.10

#include<stdio.h>
#define SIZE 8
int main()
{
	int  number[SIZE];
	printf("please input eight numbers:");
	for(int i=0;i<8;i++)
		scanf("%d",&number[i]);
	for(int j=SIZE-1;j>=0;j--)
		printf("%5d",number[j]);
	printf("\n");
	return 0;
}