1130c练习题

求1+2!+3!+…+10!的和

#include <stdio.h>

int facfor(int num)
{
    int sum = 1;
    int i;
    for (i = 1; i <= num ; i++)
    {
        sum = i*sum;
    }
    return sum;
}

int main()
{
    int num;
    int sum = 0;
    printf("plz input a num:\n");
    scanf("%d",num);
    int i;
    for(i = 1; i <= num ;i++)
    {
        sum = sum + factor(i);
    }
    printf("sum is = %d\n",sum);
    return 0;
}

打印出所有的“水仙花数”，所谓“水仙花数”是指一个三位数，其各位数字立方和等于该数本身。例如：153是一个“水仙花数”，因为153=1的三次方＋5的三次方＋3的三次方。

#include<stdio.h>
int main()
{
    int i;
    int a,b,c;
    for(i = 100 ; i < 1000 ; i++)
    {
        a = (i%10)*(i%10)*(i%10);
        b = ((i/10)%10)*((i/10)%10)*((i/10)%10);
        c = (i/100)*(i/100)*(i/100);
        if(i == a + b + c)
          printf("%d\n",i);
    }
    return 0;
}

求s=a+aa+aaa+aaaa+aa…a的值，其中a是一个数字。例如2+22+222+2222+22222(此时共有5个数相加)，几个数相加由键盘控制

#include <stdio.h>

int sum(int num , int n) 
{
    int i;
    int sum0 = 0;
    int sum1 = 0;
    for (i = 0 ; i < n ; i++)
    {
        sum0 = sum0*10 + num;
        sum1 = sum1 + sum0;
    }
    return sum;
}

int main()
{
    int num;
    int n;
    printf("plz input number and times")
    scanf("%d%d",&num ,&n);
    printf("sum = %d", sum(num ,n))
    return 0;
}

编程实现输入5个学生的学号、计算他们的期中和期末成绩，然后计算其平均成绩，并输出成绩表。（结构体）

#include <stdio.h>
#include <stdlib.h>
 
#define ARRAY_LEN 100 
     
typedef struct {
    int no; /*stunum*/
    char name[ARRAY_LEN]; /*name*/
    float score1; /*average*/
    float score2; /*mid grade*/
    float score3; /*term grade*/
    float totalScore; /*total grade*/
} student;
 
/*set up*/
void initInfo (student stu[], int *stuNum) {
    *stuNum = 5; /*number of the student*/
}
 
/*input information*/
void inputInfo (student stu[], int stuIndex) {
    int i;
 
    printf ("Number of the student%d is:\n", stuIndex+1);
     
    printf ("student number:");
    scanf ("%d",&stu[stuIndex].no);
    printf ("student name:");
    scanf ("%s",&stu[stuIndex].name);
         
    printf ("average score:");
    scanf ("%f",&stu[stuIndex].score1);
    printf ("mid score:");
    scanf ("%f",&stu[stuIndex].score2);
    printf ("term score:");
    scanf ("%f",&stu[stuIndex].score3);
     
    putchar ('\n');
}
 
/*calc the term score*/
void calculationScore (student stu[], int stuIndex) {
    float sco1Ratio = 0.1; /*avg proportion*/
    float sco2Ratio = 0.3; /*mid*/
    float sco3Ratio = 0.6; /*term*/
     
    stu[stuIndex].totalScore =  stu[stuIndex].score1 * sco1Ratio + stu[stuIndex].score2 * sco2Ratio + stu[stuIndex].score3 * sco3Ratio;
}
 
/*output*/
void printInfo (student stu[], int stuIndex)
{
    int i;
    printf ("%d\t",stu[stuIndex].no);
    printf ("%s\t",stu[stuIndex].name);
    printf ("%.2f\t\t",stu[stuIndex].score1);
    printf ("%.2f\t\t",stu[stuIndex].score2);
    printf ("%.2f\t\t",stu[stuIndex].score3);
    printf ("%.2f",stu[stuIndex].totalScore);  
    putchar ('\n');
}
 
int main (void)
{
    int stuNum,i;
    student stu[ARRAY_LEN];
     
    initInfo (stu,&stuNum);
     
    puts ("plz input the student info:");
    putchar ('\n');
    for (i=0; i<stuNum; i++) 
	{
        inputInfo (stu,i);
        calculationScore (stu,i);
    }
    putchar ('\n');
    printf ("%d student input complete", stuNum);
    putchar ('\n');
    puts ("================================================================\n");
     
  
    puts ("stu num\t name\t avgcsore\t mid score\t term score\t total score");
    for (i=0; i<stuNum; i++)
        printInfo (stu,i);
     
    getch ();
    return 0;
}

将字符串“We Are Family!”，去除空格后打印出来。（WeAreFamily!）

#include <stdio.h>

char *chstr(char *p) 
{
    int i = 0;    
    int j = 0;
   for (; *(p + i) != '\0'; ++i)
   {
        if( *(p + i) != ' ') 
        {
            *(p + j++) = *(p + i);   
        }
   }
         *(p + j) = '\0';    
    return p;            
}

int main()
{
    char str[] = "We Are Family!";

    printf("This language is = %s\n", str);
    printf("After process = %s\n", chstr(str)); 

    return 0;
}

输入一个字符串，判断其是否是回文。(回文：即正读和反读都一样，如abcba, abccba)

#include <stdio.h>
int Str_Circ(char *str)
{
    int i;
    int lenth;
    int flag = 0;
    for(i = 0 ; i < lenth/2 ; i++)
    {
        if(str[i] == str[lenth - 1 - i])
        {
            flag = 1;
        }
        else
        {
            flag = 0;
        }
    }
    return flag;
}
int main()
{
    int flag = 0;
    char str[100];
    char *ptr;
    gets(str);
    ptr = str;
    flag = Str_Circ(ptr) ;
    if (flag == 0)
    {
        printf ("false");
    }
    if (flag == 1)
    {
        printf("truth");
    }
    return 0;
}