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

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

The operation results are as follows:

Example 6.2 solving Fibonacci sequence problem with array

#include <stdio.h>
int main()
{
   int i;
   int f[20]={1,1};
   for(i=2;i<20;i++)
      f[i]=f[i-2]+f[i-1];
   for(i=0;i<20;i++)
      {
        if(i%5==0)  printf("\n");
        printf("%12d",f[i]);
      }
   printf("\n");
   return 0;
}

The operation results are as follows:

Example 6.3 there are ten areas, which are required to be arranged in the order of small to large

#include <stdio.h>
int main()
{
  int a[10];
  int i,j,t;
  printf("input 10 numbers:\n");
  for(i=0;i<10;i++)
     scanf("%d",&a[i]);
  printf("\n");
  for(j=0;j<9;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;}
  printf("the sorted numbers:\n");
  for(i=0;i<10;i++)
      printf("%d ", a[i]);
  printf("\n");
  return 0;
} 

The operation results are as follows:

Example 6.4 interchange the elements of a two-dimensional array row and column and store them in another 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("array a:\n");
	for(i=0;i<=1;i++)
	{
		for(j=0;j<=2;j++)
		{
			printf("%5d",a[i][j]);
			b[j][i]=a[i][j];
		}
			printf("\n");
	}

	printf("array b:\n");
	for(i=0;i<=2;i++)
	{
		for(j=0;j<=1;j++)
		{
			printf("%5d",b[i][j]);
		}
			printf("\n");
	}
	printf("\n");
	return 0;
}

The operation results are as follows:

Example 6.5 has a 3 x 4 matrix, which requires the program to find out the value of the element with the largest value, as well as the row number and column number

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

The operation results are as follows: