大学生C语言课后习题全部答案详解.docx

#includemain()int a,b,he,cha,ji;doubleshang;a=8;b=3;he=a+b;cha=a-b;ji=a*b;shang=(double)a/b;printf(和=%dn,he);printf(差=%dn,cha);printf(积=%dn,ji);printf(商=%fn,shang);#includemain()double r,h,v,pi;pi=3.14;r=2.5;h=3.5;v=pi*r*r*h;printf(面积=%fn,v);#include#include#includemain()char ch;system(cls);printf(|-|n);printf(| 请输入编号（0-7） |n);printf(|-|n);printf(| 1创建通讯录 |n);printf(| 2显示通讯录 |n);printf(| 3查询通讯录 |n);printf(| 4修改通讯录 |n);printf(| 5添加通讯录 |n);printf(| 6删除通讯录 |n);printf(| 7排序通讯录 |n);printf(| 0退出 |n);printf(|-|n);printf(请输入选项n);ch=getch();putch(ch);#include#includemain()/定义int a=0,b=0,he=0,cha=0,ji=0;double shang,x;/防止a，b 的值为0printf(请输入非零的an);scanf(%d,&a);printf(请输入非零的bn);scanf(%d,&b);/运算he=a+b;cha=a-b;ji=a*b;shang=a/b;x=(float)a/b;/输出printf(result:n);printf(a+b=%dn,he);printf(a-b=%dn,cha);printf(a*b=%dn,ji);printf(a/b=%fn,shang);printf(float)a/b=%fn,x);#include#includemain()/定义int a=0,b=0,he=0,cha=0,ji=0;double shang,x;/防止a，b 的值为0doprintf(请输入非零的an);scanf(%d,&a);while(a=0);doprintf(请输入非零的bn);scanf(%d,&b);while(b=0);/运算he=a+b;cha=a-b;ji=a*b;shang=a/b;x=(float)a/b;/输出printf(result:n);printf(a+b=%dn,he);printf(a-b=%dn,cha);printf(a*b=%dn,ji);printf(a/b=%fn,shang);printf(float)a/b=%fn,x);#includemain()int a=0,b=4;printf(请输入一个不多于4位的正整数:);scanf(%d,&a);if(a=0&a10)b=1;if(10=a&a100)b=2;if(100=a&a1000)b=3;printf(输出%dn,b);#include#includemain()float a,b,c,delta;double x1,x2;printf(请输入a,b,c:n);scanf(%f%f%f,&a,&b,&c);delta=b*b-4*a*c;if(delta0)printf(方程无实数解！n);elsex1=(-b+sqrt(delta)/2*a; x2=(-b-sqrt(delta)/2*a;printf(x1=%f,x2=%fn,x1,x2);#includemain()int year,flay;printf(请输入年份：n);scanf(%d,&year);if(year%400=0)flay=1;else if(year%4=0&year%100!=0)flay=1;else flay=0;switch(flay) case 0: printf(%d为平年n,year);break; case 1: printf(%d为闰年n,year);break;#includemain()int year,flay;printf(请输入年份：n);scanf(%d,&year);if(year%400=0)flay=1;else if(year%4=0&year%100!=0)flay=1;else flay=0;switch(flay) case 0: printf(%d为平年n,year);break; case 1: printf(%d为闰年n,year);break;#include#includemain()int a,b,c;double d,x1,x2;scanf(%d%d%d,&a,&b,&c);d=b*b-4*a*c;if(d0)printf(没有实根n);elsex1=(-b+sqrt(d)/(2*a);x2=(-b-sqrt(d)/(2*a);printf(x1=%f,x2=%fn,x1,x2);#include#includemain()int a,b,c;double d,x1,x2;scanf(%d%d%d,&a,&b,&c);if(a=0)printf(不合法的一元二次方程n);elsed=b*b-4*a*c;if(d0)printf(没有实根n);elsex1=(-b+sqrt(d)/(2*a);x2=(-b-sqrt(d)/(2*a);printf(x1=%f,x2=%fn,x1,x2); #include#includemain()int a,b,c;double d,x1,x2;scanf(%d%d%d,&a,&b,&c);if(a=0)printf(不合法的一元二次方程n);elsed=b*b-4*a*c;if(d0)printf(没有实根n);elsex1=(-b+sqrt(d)/(2*a);x2=(-b-sqrt(d)/(2*a);printf(x1=%f,x2=%fn,x1,x2); #include#includemain()int a,b,c;double d,x1,x2;scanf(%d%d%d,&a,&b,&c);if(a=0)printf(不合法的一元二次方程n);elsed=b*b-4*a*c;if(d0)printf(没有实根n);elsex1=(-b+sqrt(d)/(2*a);x2=(-b-sqrt(d)/(2*a);printf(x1=%f,x2=%fn,x1,x2); #includemain()int y;printf(请输入年份：);scanf(%d,&y);if(y0)if(y%400=0)printf(%d年是闰年n,y);else if(y%100=0)printf(%d年是闰年n,y);else if(y%4=0)printf(%d年是闰年n,y);elseprintf(%d年不是闰年n,y);elseprintf(错误n);#includemain()int y,m,d,yt,mt,dt,age;printf(请按格式2010-12-10输入你的生日);scanf(%d-%d-%d,&y,&m,&d);printf(请按格式2010-12-10输入今天的日期);scanf(%d-%d-%d,&yt,&mt,&dt);age=yt-y;if(mt=m)age-;printf(你的年龄是：%dn,age);#includemain()int a,b,c;printf(输入三角形的三个边长);scanf(%d%d%d,&a,&b,&c);if(a+bc) & (b+ca) & (a+cb)if(a=b | b=c | a=c )if(a=b & b=c)printf(等边三角形n);elseprintf(等腰三角形n);elseprintf(一般三角形n);elseprintf(不能构成三角形n);#includemain()int i,n=0;for(i=100;i1000;i+)if(i%10=2 | i%100=2)printf(%4d,i);n+;printf(n);printf(%d,n);#includemain()int i,n=0;for(i=100;i1000;i+)if(i%10=2 | i%100=2)printf(%4d,i);n+;printf(n);printf(%d,n);#includemain()int i,n=0;for(i=100;i1000;i+)if(i%10=2 | i%100=2)printf(%4d,i);n+;printf(n);printf(%d,n);#include#includemain()int n=0,s=1,i=0;printf(input:);scanf(%d,&n);for(i=1;i=n;i+)s=s*2;printf(2%d=%dn,n,s);#include#includemain()int n=0,sum=0,i=0;printf(input:);scanf(%d,&n);for(i=1;i=n;i+)sum=sum+pow(2,i);printf(21+22+.2n=%d,sum);#include#includemain()int n=0,sum=0,i=0;printf(input:);scanf(%d,&n);for(i=1;i=n;i+)sum=sum+pow(2,i);printf(21+22+.2n=%d,sum);#includemain()char a=0,b=0;int sum=0;printf(请输入两个数字：);a=getchar();b=getchar();sum=(a-0)+(b-0);printf(%dn,sum);#includemain()char a,b;int c,d;printf(请输入字符型数字);scanf(%c %c,&a,&b);c=a-0;d=b-0;printf(n%d,c+d);#include/#define num 10main()int a120,b120,a,b,num=20,i=0;/a120是存放成绩，b120存放学号，/a是成绩查找的上限，b是成绩查找的下限/获得数据printf(输入学生20组成绩和学号);for(i=0;inum;i+)printf(n请输入学号:);scanf(%d,&b1i);printf(请输入分数:);scanf(%d,&a1i);printf(n请输入你要查找分数段的下限：);scanf(%d,&a);printf(n请输入你要查找分数段的上限：);scanf(%d,&b);printf(查找结果是：);for(i=0;i=a & a1i=b)printf(n学号：%d 成绩：%d,b1i,a1i);printf(n);#include/#define num 10main()int a10,b10,num=10;int i=10,j=10,t;/获得数据printf(输入学生10组成绩和学号);for(i=0;inum;i+)printf(n请输入学号:);scanf(%d,&bi);printf(n请输入分数:);scanf(%d,&ai);/冒泡交换位置for(i=0;inum-1;i+)for(j=0;jnum-1;j+)if(ajaj+1) t=aj;aj=aj+1;aj+1=t;t=bj;bj=bj+1;bj+1=t;/循环输出printf(前三名是：);for(i=0;i3;i+)printf(n第%d名 学号：%d 成绩：%d,i+1,bi,ai);#include#includemain()char a100=,b100=;int i,n,j=0;printf(INPUT:);gets(a);n=strlen(a);for(i=0;i=a& ai=A & ai=Z)bj=ai;j+;printf(结果是);puts(b);#include#includemain()char a100=,b100=;int i,n,j=0;printf(INPUT:);gets(a);n=strlen(a);for(i=0;i=a& ai=A & ai=Z)bj=ai;j+;printf(结果是);puts(b);#include#includemain()char a100=;int i,n,j=0,k=0;printf(INPUT:);gets(a);n=strlen(a);for(i=0;i=n;i+)if(ai=() j+;if(ai=) k+;printf(结果是: (有%d个, )有%d个 n,j,k);if(j!=k) printf(两者的数目不相等n);else printf(两者的数目相等n);#include#define M 3#define N 5main() int aNM=0,bNN=0,cMN=0,i=0,j=0;printf(input a:n);for(i=0;iN;i+)for(j=0;jM;j+)printf(a%d%d=,i+1,j+1);scanf(%d,&aij);printf(input b:n);for(i=0;iN;i+)for(j=0;jM;j+)printf(b%d%d=,i+1,j+1);scanf(%d,&bij);for(i=0;iN;i+)for(j=0;jM;j+)cij=aij+bij;printf(output c:n);for(i=0;iN;i+)for(j=0;jM;j+)printf(%4d,cij);printf(n);#include#includemain()char a100=;int i,n,j=0,k=0;printf(INPUT:);gets(a);n=strlen(a);for(i=0;i=n;i+)if(ai=() j+;if(ai=) k+;printf(结果是: (有%d个, )有%d个 n,j,k);if(j!=k) printf(两者的数目不相等n);else printf(两者的数目相等n);#include#includemain()char a100=,b100=;int i,n,j=0;printf(INPUT:);gets(a);n=strlen(a);for(i=0;i=a& ai=A & ai=Z)bj=ai;j+;printf(结果是);puts(b);#include/#define num 10main()int a10,b10,num=10;int i=10,j=10,t;/获得数据printf(输入学生10组成绩和学号);for(i=0;inum;i+)printf(n请输入学号:);scanf(%d,&bi);printf(n请输入分数:);scanf(%d,&ai);/冒泡交换位置for(i=0;inum-1;i+)for(j=0;jnum-1;j+)if(ajaj+1) t=aj;aj=aj+1;aj+1=t;t=bj;bj=bj+1;bj+1=t;/循环输出printf(前三名是：);for(i=0;i3;i+)printf(n第%d名 学号：%d 成绩：%d,i+1,bi,ai);#include/#define num 10main()int a120,b120,a,b,num=20,i=0;/a120是存放成绩，b120存放学号，/a是成绩查找的上限，b是成绩查找的下限/获得数据printf(输入学生20组成绩和学号);for(i=0;inum;i+)printf(n请输入学号:);scanf(%d,&b1i);printf(请输入分数:);scanf(%d,&a1i);printf(n请输入你要查找分数段的下限：);scanf(%d,&a);printf(n请输入你要查找分数段的上限：);scanf(%d,&b);printf(查找结果是：);for(i=0;i=a & a1i=b)printf(n学号：%d 成绩：%d,b1i,a1i);printf(n);#include#include#includemain()int a55=0;int i=0,j=0;printf(原矩阵n);for(i=0;i5;i+)for(j=0;j5;j+)aij=rand()%20+1;printf(%4d ,aij);printf(n);for(i=0;i5;i+)aii=2*aii;printf(变化后矩阵n);for(i=0;i5;i+)for(j=0;j5;j+)printf(%4d ,aij);printf(n);#include#includemain() char a100=,t=;int i=0,j=0,n=0;printf(input: );gets(a);n=strlen(a);/这里的排序是用冒泡排序法的for(i=0;i=n-1;i+)for(j=0;j=n-1;j+)if(ajaj+1)/判断ASCII码的大小来排序t=aj;aj=aj+1;aj+1=t;printf(nresult:);puts(a);#include#includemain()char a100=,b100=;int i=0,j=0,n=0;printf(input: );gets(a);n=strlen(a);for(i=0;i=a & ai=z)bj=ai;j+;printf(nresult: );puts(b);#include#include#includemain()char a100=; /a用于存储字符串int i,n,j=0,m,c26=0; /m表示第几个字母，cm用于计数第m个字母的出现次数，printf(输入（少于100个字符）：);gets(a);n=strlen(a);for(i=0;i=a& ai=A & ai=Z) /保证它是英语字母ai=tolower(ai); /为了方便，将字符串中的英语字母都转成小写m=ai-0-49;cm+; /计数j+;printf(结果是n);for(i=0;i=25;i+) printf(%c出现的次数 是： %dn,i+65,ci);#include#include#includemain()char a100=; /a用于存储字符串int i,n,j=0,c26=0; /cm用于计数第m个字母的出现次数，printf(输入（少于100个字符）：);gets(a);n=strlen(a);for(i=0;i=a& ai=A& ai=Z) j=ai-65; cj+; /为了方便，将字符串中的英语字母都转成小写printf(结果是n);for(i=0;i=25;i+) printf(%c or%c出现的次数 是： %dn,i+97,i+65,ci);#includevoid f(int x,int y,int a,int b,int *m,int *n);main()int x=0,y=0,a=0,b=0,m=0,n=0;printf(input x,y );scanf(%d%d,&x,&y);printf(input a,b );scanf(%d%d,&a,&b);f(x,y,a,b,&m,&n);printf(%d+%di+%d+%di=%d+%din,x,y,a,b,m,n);void f(int x,int y,int a,int b,int *m,int *n)*m=x+a;*n=y+b;#include#includedouble myfun(int a,int b) /f(a,b)=abint i=0;double s=1;for(i=1;i=b;i+)s=s*a;return s;main()int a=0,b=0;printf(input:a,b );scanf(%d%d,&a,&b);printf(nsin(%d%d)=%fn,a,b,sin(myfun(a,b);#includeint max(int *a);main()int a10=0,i=0,k=0;printf(input date: t);for(i=0;i10;i+) scanf(%d,&ai); k=max(a);printf(max: a%d=%dn,k,ak);int max(int *p)int i=0,j=0,k=0;for(i=1; i10; i+)if(pkpi) k=i;return k;#includevoid mysum1(int x1,int x2,int *a);void mysum2(int y1,int y2,int *b);main()int x1=0,y1=0,x2=0,y2=0,a=0,b=0;printf(请输入第一个复数的实部和虚部： x1和y1);printf(n);scanf(%d%d,&x1,&y1);printf(n);printf(请输入第二个复数的实部和虚部： x2和y2);printf(n);scanf(%d%d,&x2,&y2);printf(n);mysum1(x1,x2,&a);mysum2(y1,y2,&b);printf(%d+%di,a,b);printf(n);void mysum1(int x1,int x2,int *a)*a=x1+x2; void mysum2(int y1,int y2,int *b)*b=y1+y2; #include int mymax(int a,int b);void main() int x=0,y=0,z=0;printf(input x,y:);scanf(%d%d,&x,&y);z=mymax(x,y);printf(max=%dn,z);int mymax(int a,int b)if (ab) a=b;return a;#include int myfun(int a);main() int x=0,y=0;printf(input x:);scanf(%d,&x);y=myfun