Seventh test report

Seventh test report

experimental project:

1. Application of one-dimensional array of

application 2. The two-dimensional array of

application 3. The array of characters

Name: Yuan Cheng experiment Venue: Teaching Building 514 classroom experiment Time: May 16

1, experimental purposes and requirements

1. one-dimensional array of applications

Define a one-dimensional array of integers, and its size is 10, i.e., it can store 10 data;

Use loop, generating an array of 10 integers stored in the random function;

· SORT1 write ordering function ();

Use loop , the number of sorted 10 sequentially outputs.

2. Application of two-dimensional array

* How to define and use a two-dimensional array;

what * is calculated using a two-dimensional array of values in circulation;

Use cycle sequentially output two-dimensional array of elements;

· determine if statements in accordance with the conditions of a character is a capital letter.

3. Application of the array of characters

· Using scanf () function, a character string stored in the input from the keyboard character array ;;

-determined length of the string;

* comparative sequence for loop, the loop half of the length of the final value;

· a set identifier ch, the initial value for 'Y', if not equal to a character, it is set to 'N'.

· The ch is 'Y' or 'N', the output whether the string is a palindrome.

Dian two experimental content

7.3.1 Lab Exercises

1. Problem Description

A: programming, using a random function to generate an integer of 10, in ascending order output.
II: Write a function of an integer randomly generated 10 in ascending order of sorting (selection sorting method implemented).

2. Experiment Code

A flow chart:

#include "stdio.h"
#include "stdlib.h"
#include "time.h"
void sort1(int s[],int n)
{
    int i,j,temp;
    for(i=0;i<n-1;i++)
    {
        for(j=9;j>=i+1;j--)
        {
            if(s[j]<s[j-1])
            {
                temp=s[j];
                s[j]=s[j-1];
                s[j-1]=temp;
            }
        }
    }
}
main()
{
    int i,a[10];
    printf("随机产生10个整数：\n");
    srand((unsigned) time(NULL));
    for(i=0;i<10;i++)
    {
        a[i]=rand()%100;
        printf("%d  ",a[i]);
    }
    sort1(a,10);
    printf("输出排序后的结果：\n");
    for(i=0;i<10;i++)
    {
        printf("%d  ",a[i]);
    }
}

Results Figure:

Two Flowchart:

#include "stdio.h"
#include "stdlib.h"
#include "time.h"
void sort2(int s[],int n)
{
    int i,j,k,temp;
    for(i=0;i<n-1;i++)
    {
        k=i;
        for(j=i+1;j<=n-1;j++)
        {
            if(s[j]<s[k])
            {
                k=j;
            }
        }
        if(k!=i)
        {
            temp=s[k];
            s[k]=s[i];
            s[i]=temp;
        }
    }
}
main()
{
    int i,a[10];
    printf("随机产生10个整数：\n");
    srand((unsigned) time(NULL));
    for(i=0;i<10;i++)
    {
        a[i]=rand()%100;
        printf("%d  ",a[i]);
    }
    sort2(a,10);
    printf("输出排序后的结果：\n");
    for(i=0;i<10;i++)
    {
        printf("%d  ",a[i]);
    }
}

Results Figure:

3. Analysis

Question: experiment, the function for generating random numbers do not know how to use.
Workaround: srand and rand function is used in combination.

7.3.2 Lab Exercises

1. Problem Description

A: programming from a number of keyboard rows, the specified number of rows output Pascal triangle.
Two: Write a program from the keyboard respectively Enter the year, month, day, calculated from the day the first few days of this year.

2. Experiment Code

A flow chart:

#include "stdio.h"
main()
{
    int a[50][50],i,j,n,y,x;
    printf("请输入杨辉三角形行数：");
    scanf("%d",&n);
    for(i=1;i<=n;i++)
    {
        a[i][i]=1;
        a[i][1]=1;
    }
    for(i=3;i<=n;i++)
    {
        for(j=2;j<=i-1;j++)
        {
            a[i][j]=a[i-1][j-1]+a[i-1][j];
        }   
    }
    for(x=1;x<=n;x++)
    {
        for(y=1;y<=n;y++)
        {
            if(y<=x)
            {
                printf("%d ",a[x][y]);
            }
        }
        printf("\n");
    }
    
}

Results Figure:

Two Flowchart:

#include "stdio.h"
int day_tab[2][13]=
{
    {0,31,28,31,30,31,30,31,31,30,31,30,31},
    {0,31,29,31,30,31,30,31,31,30,31,30,31}
};
int day(int y,int m,int d)
{
    int i,j,s=0;
    if(y%4==0&&y%100!=0||y%400==0)
    {
        i=1;
    }
    else
    {
        i=0;
    }
    for(j=1;j<m;j++)
    {
        s=s+day_tab[i][j];
    }
    s=s+d;
    return s;
}
main()
{
    int y,m,d;
    printf("请分别输入年、月、日：");
    scanf("%d%d%d",&y,&m,&d);
    printf("是这年的第%d天",day(y,m,d)); 
}

Results Figure:

3. Analysis

Issue: The experiment did not have a problem.

Dian two experimental content

7.3.3 Lab Exercises

1. Problem Description

A: programming, a character string input from the keyboard, determines whether it is a palindrome.

2. Experiment Code

A flow chart:

#include "stdio.h" 
#include "string.h"
#define N 40
main()
{
    char str[N],ch='Y';
    int i;
    int len;
    printf("Input a string:");
    scanf("%s",&str);
    len=strlen(str);
    for(i=0;i<=len;i++)
    {
        if(str[i]!=str[len-1-i])
        {
            ch='N';
            break;
        }
    }
    if(ch=='Y')
    {
        printf("%s是回文",str); 
    }
    else
    {
        printf("%s不是回文",str);
    } 
}

Results Figure:

3. Analysis

Problem: The results will be running against each other, should not be a palindrome is a palindrome.
Solution: Add i <= len, on the for loop.

Third, test summary

Harvest: The experiment greatest achievement is to understand the usage of srand function, as well as methods for the use of arrays easier to clear.
Inadequate: this experiment, I found that I do not understand for commonly used functions is not enough, not flexible to use, but also need more strengthened.