實(shí)驗(yàn)六函數(shù)與編譯預(yù)處理

1、.實(shí)驗(yàn)六 函數(shù)與編譯預(yù)處理1.void main()float a,b,c;scanf("%f%f",&a,&b);c=add(a,b);printf("sum is %fn",c);float add(float x,float y)float z;z=x+y;return(z);/錯(cuò)誤的地方,(1)沒(méi)有包含頭文件<stdio.h> (2)函數(shù)定義應(yīng)該在函數(shù)調(diào)用的前面.更正后的程序:#include<stdio.h>float add(float x,float y)float z;z=x+y;return(z)

2、;void main()float a,b,c;scanf("%f%f",&a,&b);c=add(a,b);printf("sum is %fn",c);2.void main()int a=3,b=6;printf("a=%d,b=%dn",a,b);exchange1(a,b);printf(:a=%d,b=%dn",a,b);void exchange1(int x,int y)int t;t=x;x=y;y=t;printf("x=%d,y=%dn",x,y);/錯(cuò)誤的地方,(1

3、)沒(méi)有包含頭文件<stdio.h> (2)函數(shù)定義應(yīng)該在函數(shù)調(diào)用的前面.更正后的程序:#include<stdio.h>void exchange1(int x,int y)int t;t=x;x=y;y=t;printf("x=%d,y=%dn",x,y);void main()int a=3,b=6;printf("a=%d,b=%dn",a,b);exchange1(a,b);printf("a=%d,b=%dn",a,b);3.long int fac(int n)long int p;int i;p=

4、1;for(i=1;i<=n;i+)p=p*i;return(p);int cmn(int m,int n)int x;x=fac(m)/(fac(n)*fac(m-n);return(x);void main()int m,n,c;scanf("%d%d",&m,&n);c=cmn(m,n);printf("c=%dn",c);/應(yīng)該加個(gè)#include<stdio.h> 頭文件4.int a=7,b=9;void main()int i,a=5,x=80,y=60;for(i=1;i<4;i+)printf(&

5、quot;a=%d,b=5d,max=%dn",a,b,max(a,b);b+=6;printf("result_sum=%dn",sum(x,y);int sum(int x,int y)extern int m,n;int temp;temp=x+y+m+n+a+b;return(temp);int m=12,n=25;int max(int 1,int b)return(a>b?a:b);程序更正:#include<stdio.h>int a=7,b=9;void main()int i,a=5,x=80,y=60;int max(int

6、a,int b);int sum(int x,int y);for(i=1;i<4;i+)printf("a=%d,b=5d,max=%dn",a,b,max(a,b);b+=6;printf("result_sum=%dn",sum(x,y);int sum(int x,int y)extern int m,n;int temp;temp=x+y+m+n+a+b;return(temp);int m=12,n=25;int max(int a,int b)return(a>b?a:b);5.調(diào)試運(yùn)行以下程序.#include<stdi

7、o.h>int fun(int a)int b=0;static int c=2;b+=c;c+=1;return(a+b-c);void main()int a=3,i;for(i=0;i<3;i+) printf("%4d",fun(a);6.略7.略8.#include<stdio.h>#define DEBUGvoid main()int a=14,b=15,temp;temp=a/b;#ifdef DEBUGprintf("a=%d,b=%d",a,b);#endifprintf("temp=%dn"

8、,temp);程序結(jié)果為:a=14,b=15,temp=0(1)第二行中,宏定義是可以沒(méi)有具體的值的,在這里只是定義了一個(gè)宏名.DEBUG沒(méi)有值.(2)第79行為:#ifdef DEBUGprintf("a=%d,b=%d",a,b);#endif會(huì)被編譯,因?yàn)榉N種原因DEBUG已經(jīng)被定義過(guò).(3)如將第2行刪除,程序運(yùn)行結(jié)果為:temp=0 因?yàn)闆](méi)有定義DEBUG,所以原來(lái)第79行的程序沒(méi)有執(zhí)行.(4)第9行不能刪除,因?yàn)?ifdef 和 #endif必須成對(duì)出現(xiàn).9.編程題#include<stdio.h>long int fac(int n)long int p;int i;p=1;for(i=1;i<=n;i+)