C primer plus 第二章源碼和課後題

第一章

源碼

//2.1
#include <stdio.h>
#include <stdlib.h>

int main()
{
    int num;
    num=1;
    printf("I am a simple ");
    printf("computer.\n");
    printf(" My favourite number is %d because it is first.\n",num);

    return 0;
}

//2.2
 /*把2英尋轉換成英尺*/
#include<stdio.h>
int main()
{
	int feet,fathoms;
	
	fathoms = 2;
	feet = 6*fathoms;
	printf("There are %d feet in %d fathoms!\n",feet,fathoms);
	printf("Yes, i said %d feet !\n",6 * fathoms);
	
	return 0;
 } 

//2.3  2個函數
#include <stdio.h>
#include <stdlib.h>
void butler(viod);
int main(viod)
{
    printf("I will summon the buter function.\n");
    buter();

    printf("Yes. Bring me some tea and writeable DVDs.\n");

    return 0;
}
void buter(viod)
{
    printf("You rang, sir?\n");
}

 

//2.4
//修改語法錯誤的函數，修正後
//2.4
#include<stdio.h>
int main(void)
(
	int n ,n2, n3;
	
	n = 5;
	n2 = n * n;
	n3 = n2 * n2;
	printf("n = %d,n squard = %d,n cubed = %d\n", n,n2 , n3)
	
	return 0;
)

 

//2.5改過語義錯誤
#include<stdio.h>
int main(void)
{
	int n,n2,n3;
	
	n = 5;
	n2 = n*n;
	n3 = n2*n;
	printf("n = %d, n squared = %d, n cubed = %d\n",n,n2,n3);
	return 0;
 } 

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編程練習

//1.1打印的名字改過了
#include <stdio.h>
#include <stdlib.h>

int main(viod)
{


    printf("Zhang san\n");
    printf("Zhang\nsan\n");
    printf("Zhang ");
    printf("san");

    return 0;
}

 

//2.2
#include <stdio.h>
#include <stdlib.h>

int main(viod)
{


    printf("Li si\n");
    printf("Shandong\n");

    return 0;
}

 

//2.3
#include <stdio.h>
#include <stdlib.h>

int main(viod)
{
int age,days;
 age=21;
days=365*age ;



    printf("I have alived %d days\n",days);

    return 0;
}

 

//2.4
#include <stdio.h>
#include <stdlib.h>
void jolly(void);
void deny(void);
int main(viod)
{
    jolly();
    jolly();
    jolly();
    deny();

    return 0;
}
void jolly(void)
{
    printf("For he's a jolly good fellow!\n");


}
void deny(void)
{
    printf("Which nobody can deny!\n");
}

 

//2.5
#include <stdio.h>
#include <stdlib.h>
void br(void);
void ic(void);
int main(viod)
{
    br();
    ic();
    printf("India, China\n");
      printf("Brazil, Russia,");

    return 0;
}
void br(void)
{
    printf("Brazil, Russia,");


}
void ic(void)
{
    printf("India, China\n");
}

 

//2.6
#include <stdio.h>
#include <stdlib.h>

int main(viod)
{
    int toes=10;
    printf("toes的值爲%d\n",toes);
     printf("toes兩倍的值爲%d\n",toes*2);
      printf("toes的平方值爲%d\n",toes*toes);

    return 0;
}

 

//2.7
#include<stdio.h> 
void smile(void);
int main(void)
{
	smile(); smile(); smile();
	printf("\n");
	smile(); smile();
	printf("\n");
	smile();
	
return 0;
 } 
void smile(void)
{
	printf("Smile!");
}      

 

//2.8
#include<stdio.h>
void one_three(void);
void two(void);
int main(void)
{
	printf("Starting now:\n");
	one_three();
	
return 0;
 } 
void one_three(void)
{
	printf("one\n");
	two();//調用嵌套
	printf("three\ndone");
}
void two(void)
{
	printf("two\n");

}