C程序设计WEEK7 课上练习

1 

/* Note:Your choice is C IDE */#include "stdio.h"#define LEN 10main(){    int a[LEN];    int i;    int max;    int min;    /* i=  0 1 2 ~ 9  */    /*   a[0] a[1] 2 ~ 10  */    /* input*/    printf("please input:");    for( i=0;i<LEN;i++)     {    scanf("%d",&a[i]);    }    /*output*/    printf("\n the ordered output is:");    for( i=0;i<LEN;i++)     {    printf("%d ",a[i]);    }        printf("\n the reverse ordered output is:");    for( i=0;i<LEN;i++)     {    /* a[4],a[3] a[2] a[1] a[0] */    /*i  0    1    2    3    4 */    printf("%d ",a[LEN-1-i]);     }        max = a[0];    for(i = 1;i<LEN;i++){    if(max <a[i])     max = a[i];    }    printf("\n the MAX is :%d",max);        }

2 

/* Note:Your choice is C IDE */#include "stdio.h"#define ROW 2#define COL 3main(){   int a[ROW][COL]={1,2,3,4,5,6};   int b[ROW][COL]={{1,2,3},{4,5,6}};   int i,j;      printf("row first:\n");   for(i=0;i<ROW;i++)   {   for(j=0;j<COL;j++){   printf("%d ",a[i][j]);   }   printf("\n");      }    printf("column first:\n");   for(i=0;i<COL;i++)   {   for(j=0;j<ROW;j++){   printf("%d ",a[j][i]);   }   printf("\n");   }       }

3

/* Note:Your choice is C IDE */#include "stdio.h"main(){char a[20];char b;printf("please input your string: ");gets(a);printf("\nYour input is: ");puts(a);/*the second  a[1] */ b = a[1];if(b >= 'A' && b <= 'Z')  a[1] = a[1] + 'a' -'A';else if(b >= 'a' && b <= 'z')  a[1] = a[1] + 'A' -'a';else   a[1] = ' ';        printf("\n After change: ");puts(a);    }