上半学期.txt

c语言专业课本学期的全部练习,适合新手自学,快速上手

/*求最大值*/
#include<stdio.h>
main()
{int x,y,z;
 printf("please input x,y:");
 scanf("%d%d",&x,&y);
 z=x>y?x:y;
 printf("max is %d\n",z);
 getchar();
 getchar();
 getchar();}
/*数据类型，变量定义*/
#include<stdio.h>
main(){
int x,y,z;char h,i,j;
float a,b,c,d,e,f,g;
h='e';x=10;a=1213.456;y=3;b=1.742;i='y';g=x%y+h-y*b+(int)a;printf("g=%f\n",g);
getchar();
getchar();
}

/*1+2+……+100*/
#include<stdio.h>
main(){
int s,i;
i=1;s=0;
while(i<=100){s=s+i;++i;}
printf("s=%d,i=%d\n",s,i);
getchar() ;
}

/*表达式的值，两种自加，各种运算符和表达式*/
#include<stdio.h>
main(){
int x,y,z,i,a,b,c,d,e;i=3;
x=(i++)+(i++)+(i++);
y=(++i)+(++i)+(++i);
z=(1<4)+(2!=2)+(a=18)+(b=5)%(c=3)+((d=3*5,d*4),d=d+5);
e=4*6,e=e+8  ;
printf("x=%d,y=%d,i=%d,z=%d,e=%d",x,y,i,z,e);
getchar();
}

/*闰年判定*/
#include<stdio.h>
main(){
int s;
scanf("%d",&s);
if((s%4==0&&s%100!=0)||s%400==0) printf("s is a leap year\n",s);
else
printf("s is not a leap year\n",s);
getchar();
getchar();
}

/*一元二次方程的根*/
#include<stdio.h>
#include<math.h>
main(){
float a,b,c,deta,x1,x2,s,t;
scanf("%f,%f,%f",&a,&b,&c);
if(a==0)
{
printf("this is wrong\n");
}
else
{
   deta=b*b-4*a*c;
   if(deta>=0)
   {
   x1=(-b+sqrt(deta))/(2*a) ;
   x2=(-b-sqrt(deta))/(2*a)  ;
   printf("x1=%f,x2=%f",x1,x2);
   }
   else
   {
   s=-b/(2*a);t=sqrt(-deta)/(2*a);
   printf("x1=%f+%fi,x2=%f-%fi",s,t,s,t);
   }
 }
getchar();
getchar();
}

/*判定素数*/
#include<stdio.h>
main()
{
int n,i,d;
scanf("%d",&n);
for(i=2;i<=n-1;i++)
  {
  if((n%i)==0){d=1;}
   }
if(d==1){printf("%d is heshu\n",n);}
else{printf("%d is sushu\n",n);}
getchar();
getchar();
}

/*算术得分问题*/
#include<stdio.h>
main()
{
 int a,b,c,s,i;
 s=0;
 for(i=1;i<=10;i++)
    {
     scanf("%d %d %d",&a,&b,&c);
     if((a+b)==c){s=s+10;}
    }
 printf("s=%d\n",s);
 if(s<60){printf("bujige\n");}
 else{
      if(s<70){printf("jige\n");}
      else{
           if(s<85){printf("lianghao\n");}
           else{printf("yiuxiu\n");}
           }
      }
 getchar();
 getchar();
 }

/*运费问题*/
#include<stdio.h>
main()
{int c;
 float weight,distance,price,total,discount;
 printf("please input weight,distance and price.\n");
 scanf("%f%f%f",&weight,&distance,&price);
 if(weight<=0||distance<=0||price<=0) printf("error.\n");
 else {if(distance>=3000) c=12;
       else c=distance/250;
       switch(c)
          {
           case 0: discount=0;break;
           case 1: discount=0.02;break;
           case 2:
           case 3: discount=0.05;break;
           case 4:
           case 5:
           case 6:
           case 7: discount=0.08;break;
           case 8:
           case 9:
           case 10:
           case 11:discount=0.1;break;
           case 12:discount=0.15;break;
           }
       total=weight*distance*price*(1-discount);
       printf("The total money is %7.2f.\n",total);
       getchar();
       getchar();
      }
 }

/*输入百分制成绩，输出成绩等级*/
#include<stdio.h>
main()
{float mark;char grade;int c;
 printf("please input the mark.\n");
 scanf("%f",&mark);
 if(mark<0||mark>100) printf("error.\n");
 else {
       if(mark<60) c=5;
       else c=mark/10;
       switch(c)
          {
           case 10:
           case 9:grade='A';break;
           case 8:grade='B';break;
           case 7:grade='C';break;
           case 6:grade='D';break;
           case 5:grade='E';break;
           }
       printf("The grade is %c.\n",grade);
       getchar();
       getchar();
       }
 }

/*112页题5.10距离问题*/
#include<stdio.h>
main()
{float x,y;int h;
 printf("please input x,y.\n ");
 scanf("%f%f",&x,&y);
 if((x-2)*(x-2)+(y-2)*(y-2)<=1||(x+2)*(x+2)+(y-2)*(y-2)<=1||
     (x-2)*(x-2)+(y+2)*(y+2)<=1||(x+2)*(x+2)+(y+2)*(y+2)<=1)
 {h=10;printf("h=%d",h);}
 else{h=0;printf("h=%d",h);}
 getchar();
 getchar();
 }

/*输出100到200的全部素数*/
#include<stdio.h>
main()
{
 int n,i,flag;
 for(n=100;n<=200;n++)
    {flag=1;
     for(i=2;i<=n-1;i++)
        {if(n%i==0){flag=0;break;}}
     if(flag) printf("%d is sushu.\n",n);
     }
 getchar();
 getchar();

 }

/*计算pi的近似值*/
#include<stdio.h>
main()
{
 double pi,s;long int n;
 s= -1;pi=0;
 for(n=1;n<=20000000;n+=2){s= -s;pi=pi+s/n;}
 pi=pi*4;
 printf("pi=%f",pi);
 getchar();
 getchar();
 }

/*求Fibonacci数列的前40个数*/
#include<stdio.h>
main()
{
 double f1,f2;int i;
 f1=1;f2=1;
 for(i=1;i<=20;i++)
    {
     printf("%9.0f   %9.0f   ",f1,f2);
     f1=f1+f2;
     f2=f2+f1;
     if(i%2==0) printf("\n");
     }
 getchar();
 }

/*1!+2!+3!+……+20!*/
#include<stdio.h>
main()
{double s,t;int n;
 s=0;t=1;
 for(n=1;n<=20;n++)
    {t=n*t;s=s+t;}
 printf("s=%16.0f",s);
 getchar();
}

/*a+aa+aaa+……+aaaaa……aaaa(n个)*/
#include<stdio.h>
main()
{int a,n,i;double s,t,q;
 printf("please input n and a.\n");
 scanf("%d%d",&n,&a);
 if(n<=0||a<=0) printf("error.\n");
 else
   {s=0;t=1;q=0;
    for(i=1;i<=n;i++)
       {q=q+t;s=s+q;t=t*10;}
    s=a*s;
    printf("s=%.0f",s);
    getchar();getchar();
    }
}

/*输出图象*/
#include<stdio.h>
main()
{int i,j,n;
 for(n=1;n<=4;n++)
    {
     for(i=1;i<=4-n;i++)
        printf(" ");
     for(j=1;j<=2*n-1;j++)
        printf("*");
     printf("\n");
     }
 for(n=1;n<=3;n++)
    {
     for(i=1;i<=n;i++)
        printf(" ");
     for(j=1;j<=2*(4-n)-1;j++)
        printf("*");
     printf("\n");
     }
 getchar();
}

/*求平均值*/
#include<stdio.h>
main()
{int a[10],i;float average=0;
 for(i=0;i<10;i++)
    scanf("%d",&a[i]);
 for(i=0;i<10;i++)
    average=average+a[i];
 average=average/10;
 printf("average is %f\n",average) ;
 getchar();
 getchar();
}

/*输入10个数选出最大数*/
#include<stdio.h>
main()
{int a[10],i,max;
 for(i=0;i<10;i++)
    scanf("%d",&a[i]);
 max=a[0];
 for(i=1;i<10;i++)
    if(max<a[i]) max=a[i];
 for(i=0;i<10;i++)
    if(max==a[i]) printf("max is a[%d]=%d\n",i,max);
 getchar();
 getchar();
}

/*输入10个数从小到大排序*/
#include<stdio.h>
main()
{int a[10],i,j,t;
 for(i=0;i<10;i++)
    scanf("%d",&a[i]);
 for(i=0;i<9;i++)
    for(j=0;j<9-i;j++)
       if(a[j]>a[j+1])
          {t=a[j];a[j]=a[j+1];a[j+1]=t;}
 for(i=0;i<10;i++)
    printf("%d ",a[i]);
 getchar();
 getchar();
}

/*字符串测长*/
#include<stdio.h>
main()
{int i;char c[100];
 scanf("%s",c);
 for(i=0;c[i]!='\0';i++);
 printf("The length of the string is %d\n",i);
 getchar();
 getchar();
}

/*字符串大写化*/
#include<stdio.h>
main()
{int i;char c[100];
 scanf("%s",c);
 printf("%s\n",c);
 for(i=0;c[i]!='\0';i++)
    if(c[i]<='z'&&c[i]>='a')
      c[i]=c[i]-32;
 printf("%s\n",c);
 getchar();
 getchar();
}

/*字符串比较*/
#include<stdio.h>
main()
{char a[100];char b[100];
 int i,j,flag=1;
 scanf("%s%s",a,b);
 for(i=0;a[i]!='\0';i++);
 for(j=0;a[j]!='\0';j++);
 if(i!=j) printf("The two strings are not the same.\n");
 else for(i=0;a[i]!='\0';i++)
         if(a[i]!=b[i]) {flag=0;break;}
 if(flag) printf("The two strings are the same.\n");
 else printf("The two strings are not the same.\n");
 getchar();
 getchar();
}

/*字符串复制*/
#include<stdio.h>
main()
{char a[100];char b[100];
 int i;
 scanf("%s",b);
 printf("b is %s\n",b);
 for(i=0;b[i]!='\0';i++)
    a[i]=b[i];
 a[i]='\0';
 printf("a is %s\n",a);
 getchar();
 getchar();
 }

/*字符串连接*/
#include<stdio.h>
main()
{char a[100];char b[100];int i,j;
 scanf("%s%s",a,b);
 for(i=0;a[i]!='\0';i++) ;
 for(j=0;b[j]!='\0';j++)
    a[i+j]=b[j];
 a[i+j]='\0';
 printf("%s",a);
 getchar();
 getchar();
 }

/*译密码1*/
#include<stdio.h>
main()
{int i;char c;
 for(i=0;(c=getchar())!='\n';i++)
    {
     if(c>='A'&&c<='Z'||c>='a'&&c<='z')
       {
        c=c+4;
        if(c>'Z'&&c<'Z'+5||c>'z')
           c=c-26;
        }
     putchar(c);
     }
}

/*输入一行字符统计字母空格数字和其他字符个数*/
#include<stdio.h>
main()
{int i,num=0,other=0,ch=0,space=0;char c;
 for(i=0;(c=getchar())!='\n';i++)
    {
     if(c>='A'&&c<='Z'||c>='a'&&c<='z') ch++;
     else{
          if(c==' ') space++;
          else{
               if(c>='0'&&c<='9') num++;
               else other++;
               }
          }
     }
 printf("num=%d,other=%d,ch=%d,space=%d\n",num,other,ch,space);
 getchar();
 }


/*矩阵转置*/
#include<stdio.h>
main()
{
 int A[4][3];int B[3][4];
 int i,j;
 for(i=0;i<4;i++)
    for(j=0;j<3;j++)
       scanf("%d",&A[i][j]);
 printf("matrix A:\n");
 for(i=0;i<4;i++)
    {for(j=0;j<3;j++)
        printf("%6d",A[i][j]);
     printf("\n");}
 for(i=0;i<3;i++)
    for(j=0;j<4;j++)
       B[i][j]=A[j][i];
 printf("matrix B:\n");
 for(i=0;i<3;i++)
    {for(j=0;j<4;j++)
        printf("%6d",B[i][j]);
     printf("\n");}
 getchar();
 getchar();
 getchar();
 }

/*矩阵乘积*/
#include<stdio.h>
main()
{int A[4][3];int B[3][4];int i,j,k;int C[3][3]={0};int D[4][4]={0};
 printf("please input the matrix A:\n");
 for(i=0;i<4;i++)
    for(j=0;j<3;j++)
       scanf("%d",&A[i][j]);
 printf("\n");
 printf("please input the matrix B;\n");
 for(i=0;i<3;i++)