Example 6.1 assign 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 to ten elements in turn, and output in reverse order

#include<stdio.h>
int main()
{
    int i,a[10];
    for(i=0;i<=9;i++)
    scanf("%d",&a[i]);
    for(i=9;1>=0;i--)
    printf("%d",a[i]);
    return 0;
}

Example 6.2 use array to process Fibonacci sequence

#include<stdio.h>
int main()
{
    int a[20]={1,1};
    int i;
    for(i=2;i<20;i++)
        a[i]=a[i-2]+a[i-1];
    for(i=0;i<20;i++)
       { if(i%5==0)
         printf("\n");
         printf("%d",a[i]);
       }
       printf("\n");
       return 0;
}

Example 6.3 the area of ten areas is required to be output from small to large

#include<stdio.h>
int main()
{
    int i,j,t,a[10];
    printf("Please enter ten areas\n");
    for(i=0;i<10;i++)
        scanf("%d",&a[i]);
    for(j=0;j<10;j++)
        {
            for(i=0;i<9-j;i++)
            if(a[i]>a[i+1])
               { t=a[i];
                 a[i]=a[i+1];
                 a[i+1]=t;
               }
        }
    for(i=0;i<10;i++)
    printf("%5d",a[i]);
    printf("\n");
    return 0;
}

Example 6.4 interchange elements of row and column of a two-dimensional array

#include<stdio.h>
int main()
{
    int a[2][3]={1,2,3,4,5,6};
    int b[3][2],i,j;
    printf("The original array is\n");
    for(i=0;i<2;i++)
       { for(j=0;j<3;j++)
            {printf("%3d",a[i][j]);
             b[j][i]=a[i][j];
            }
            printf("\n");
       }
       printf("The array after exchange is\n");
     for(i=0;i<3;i++)
         {for(j=0;j<2;j++)
             printf("%3d",b[i][j]);
          printf("\n");
         }
         return 0;
}

Example 6.5 has an array of 3 * 4, which requires the output of the maximum number, as well as its row number and column number

#include<stdio.h>
int main()
{
    int a[3][4]={1,2,3,4,9,8,7,6,-10,10,-5,2},i,j;
    int row=0,colum=0,max;
    max=a[0][0];
    for(i=0;i<3;i++)
    {
        for(j=0;j<4;j++)
        if(a[i][j]>max)
        max=a[i][j];
    }
    printf("%d",max);
    printf("row=%d\ncolum=%d\n",row,colum);
    return 0;
}

Example 6.6 output a known string

#include<stdio.h>
int main()
{
    char c[15]={'I',' ','a','m',' ','a',' ','s','t','u','d','e','n','t','.'};
    int i;
    for(i=0;i<15;i++)
    printf("%d",c[i]);
    printf("\n");
    return 0;
}

Example 6.7 output a diamond

#include<stdio.h>
int main()
{
    char c[][5]={{' ',' ','*'},{' ','*',' ','*'},{'*',' ',' ',' ','*'},{' ','*',' ','*'},{' ',' ','*'}};
    int i,j;
    for(i=0;i<5;i++)
    {for(j=0;j<5;j++)
    printf("%c",c[i][j]);
    printf("\n");
    }
    return 0;
} 

Example 6.8 input a line of characters to determine how many words there are

int main()
{
    int num=0,word=0,i,string[81];
    printf("Please enter a line of characters\n");
    gets(string);
    for(i=0;(c=string[i])!='\0';i++)
    {
        if(c==' ')  word=0;
        else if(word==0)
        {num++;word=1;}
    }
    printf("This string contains%d Word\n",num);
    return 0;
}

Example 6.9 has three strings, asking for the largest one

#include<stdio.h>
int main()
{
    char str[3][20];
    char string[20];
    int i;
    for(i=0;i<3;i++)
    gets(str[i]);
    if(strcmp(str[0],str[1])<0)
    strcpy(string,str[1]);
    else  strcpy(string,str[0]);
    if(strcmp(string,str[2])<0)
    strcpy(string,str[2]);
    printf("Maximum characters are%s\n",string);
    return 0;
}