【文章內(nèi)容簡介】 )。}第二篇：c語言程序設(shè)計(jì)(科學(xué)出版社)課后習(xí)題解答第3章習(xí)題解答第1章 語言程序主要由預(yù)處理命令、函數(shù)、注釋等組成。(1)分號(hào)(2)main(3) ：include main(){printf(“*************************n”)。printf(“Hello World!n”)。printf(“*************************”)。} ：include main(){int a, b, c。/* 定義變量 */scanf(“%d”, amp。a)。/* 輸入第一個(gè)整數(shù) */ scanf(“%d”, amp。b)。/* 輸入第二個(gè)整數(shù) */ c=ab。/*計(jì)算差 */printf(“%d%d=%d”,a,b,c)。/* 輸出結(jié)果 */ } 5.(1)(2)x=10。(3)printf(“s=%dn”,s)。第2章1.(1)c(2)a(3)b g(4)a d e(5)d =4,y=6=4,y=3 =3,y=6 5.include main(){int a,b,c。scanf(“%d%d”,amp。a,amp。b)。c=a*b。printf(“%d*%d=%d”,a,b,c)。}第3章1.(1)b(2)b(3)d(4)a(5)b 2.(1)amp。a,amp。b(2)l,s(“x=%.2f,y=%.2fn”,x,y)。4.include main(){int num1,num2,num3,sum。float average。scanf(“%d%d%d”,amp。num1,amp。num2,amp。num3)。sum=num1+num2+num3。average=sum/。printf(“sum=%d,average=%.2fn”,sum,average)。} 5.include main(){int hour,minute,second,total。/* 定義變量代表時(shí)、分、秒和總秒數(shù) */scanf(“%d”,amp。total)。hour=total/3600。minute=total%3600/60。second=total%3600%60。printf(“%dhours:%dminutes:%dsecondsn”,hour,minute,second)。}第4章1.(1)a(2)b(3)b(4)b(5)b 3.(1)6(2)4(3)1(4)1 4.include main(){int x,y。scanf(“%d”,amp。x)。if(x5 amp。amp。 xy=5*x。if(x == 0)y=1。if(x0 amp。amp。 xy=2*x+1。printf(“x=%d,y=%dn”,x,y)。} 5.include main(){int score,rank。/* score 表示成績,rank 表示級(jí)別 */printf(“Please input score:”)。scanf(“%d”,amp。score)。rank=score/10。switch(rank){case 10:case 9: printf(“成績等級(jí)為：An”)。break。case 8: printf(“成績等級(jí)為：Bn”)。break。case 7: printf(“成績等級(jí)為：Cn”)。break。case 6: printf(“成績等級(jí)為：Dn”)。break。default:printf(“成績等級(jí)為：En”)。break。} } 6.include void main(){int n。printf(“Please input the digit:”)。scanf(“%d”,amp。n)。switch(n){case 1:printf(“Jan n”)。break。case 2:printf(“Feb n”)。break。case 3:printf(“Mar n”)。break。case 4:printf(“Apr n”)。break。case 5:printf(“May n”)。break。case 6:printf(“Jun n”)。break。case 7:printf(“Jul n”)。break。case 8:printf(“Agu n”)。break。case 9:printf(“Sep n”)。break。case 10:printf(“Oct n”)。break。case 11:printf(“Nov n”)。break。case 12:printf(“Dec n”)。break。} }第5章1.(1)b(2)a(3)b(4)d(5)d ,1 =1 =6 ,14 9. include main(){int i。long int sum=0。for(i=2。isum+=i。printf(“2+4+6+...+200=%ld”,sum)。} 10.include main(){long int n。int sum = 0。printf(“Please input the nber:”)。scanf(“%ld”,amp。n)。while(n!= 0){sum += n % 10。n /= 10。}printf(“%dn”, sum)。}第6章1.(1)d(2)b(3)d(4)c(5)a ,66.(1)i(2)n7.(1)char k。(2)i main(){float a[10]。int i。float sum=0,average。for(i=0。i{printf(“a[%d]=?”,i)。scanf(“%f”,amp。a[i])。sum+=a[i]。}average=sum/10。printf(“average is %.2fn”,average)。} 9.include define N 10 main(){int a[N],i,target,found。for(i=0。iscanf(“%d”,amp。a[i])。printf(“Please input a number:”)。scanf(“%d”,amp。target)。i=0。while(ii++。found = iprintf(“%dn”,found)。} 10.include define N 80 main(){char str[N]。int len=0,i=0。printf(“Please input a string:”)。gets(str)。while(str[i++]!= 0)len++。printf(“the length of string is %”,len)。}第7章 4.(1)func(2)m++,6,3,2,3 ,5,1,2,3,2 8.include int fun(int a,int b,int c)。main(){int a,b,c,max。printf(“Please input three numbers:”)。scanf(“%d%d%d”,amp。a,amp。b,amp。c)。max=fun(a,b,c)。printf(“Max is %”,max)。}int fun(int a,int b,int c){int max。max= ab?(ac?a:c):(bc?b:c)。return max。} 9.include long int sum(int n)。main(){int n。printf(“n=?”)。scanf(“%d”,amp。n)。printf(“Sum=%”,sum(n))。}long int sum(int n){if(n = = 1)return 1。else return sum(n1)+n。} 10.include void fun(n)。main(){int n。printf(“n=?”)。scanf(“%d”,amp。n)。fun(n)。}void fun(n){if(n = = 0)return。else{fun(n/2)。printf(“%2d”,n%2)。} }第8章1.(1)b(2)d(3)b(4)c(5)c 3 4 5 6 2 3 4 5 6 [i] =sum 10.include include main(){char str[80]。char *p1, *p2。gets(str)。p1=str。p2=str+strlen(str)1。while(p1puts(p1}第9章.define F(x)(x)*(x)*(x)b.define F(x)(x)%4c.define F(x,y)(x)*(y)c.define DOUBLE(x)2*(x) is undefined =6 8.include define SWAP(a,b){int temp。temp=a。a=b。b=temp。} main(){int x,y。printf(“x=?”)。scanf(“%d”,amp。x)。printf(“y=?”)。scanf(“%d”,amp。y)。SWAP(x,y)printf(“x=%d,y=%”,x,y)。}第10章 student{int sno。char sname[10]。char sex。}stu1,stu2。,b,d =25。 =5。 =5。,b,c,d(說明：變量 b 有確定的值之后，b++是合法的。)typedef struct product {char name[10]。float price。}PRODUCT。PRODUCT products[10]。6.(1)struct employee(2)printemp(emp) 4 3 9 8 8.include struct time_struct {int hour。int minute。int second。}。main(){struct time_struct time。printf(“Input time?n(Example 18:28:38)n”)。scanf(“%d:%d:%d”,amp。,amp。,amp。)。printf(“Time is %d:%d:%dn”,)。} 9.include struct time_struct {int hour。int minute。int second。}time。void enter_time()。void display_time()。main(){enter_time()。display_time()。}void enter_time(){printf(“Enter the time(example 18:28:38)?”)。scanf(“%d:%d:%d”,amp。,amp。,amp。)。}void display_time(){printf(“Time is %d:%d:%”,)。} 10.include define N 3 struct hotel {char name[31]。/*旅館名稱*/char address[31]。/*旅館地址*/int grade。/*旅館級(jí)別*/float average_charge。/*平均房價(jià)*/int number。/*房間數(shù)量*/ }h[N]={{“h1”,“上海路”,5,80}, {“h2”,“北京大街”,5,70}, {“h3”,“南京大街”,3,100} }。main(){int grade,i。printf(“請(qǐng)輸入級(jí)別(35)?”)。scanf(“%d”,amp。grade)。for(i=0。iif(h[i].grade==grade)printf(“名稱:%sn 地址:%sn 級(jí)別:%dn平均房價(jià)%.2fn 房間數(shù)量:%dn”，h[i].name,h[i].address,h[i].grade,h[i].average_charge,h[i].number)。}第11章1.(1)c(2)d(3)b(4)b(5)b (fp)4.“”, “w” 5.include include include typedef struct Employee {int id。char name[20]。char gender[20]。int age。char address[20]。}Employee。int main(void){FILE *fp。char another,choice。Employee emp。long int recsize。fp=fopen(“”,“rb+”)。if(fp==NULL){fp=fopen(“”,“wb+”)。if(fp==NULL){printf(“Can39。t Open File”)。exit(0)。}}recsize=sizeof(emp)。while(1){printf(“ ”)。printf(“Enter your choice(13):”)。fflush(stdin)。scanf(“%c”,amp。choice)。switch(choice){case39。139。:fseek(fp,0,SEEK_END)。another=39。Y39。while(another==39。Y39。|| another==39。y39。){printf(“