# 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;
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={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;
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={{1,2,3},{4,5,6}};
int b,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={{1,2,3,4},{9,8,7,6},{-10,10,-5,2}};
max=a;
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: Added by goldlikesnow on Sat, 23 Nov 2019 22:00:34 +0200