2020-04-13

1.指针的基本使用

#include

#include

void Test1()

{

    char strArr[5][10]={"qwer","ty","uiopasd","fghjkl","zxc"};

    int i,j;

    char strTemp[10]={"\0"};

    for(i=0;i<5;i++)

    {

    for(j=0;j<4;j++)

    {

    if(strlen(strArr[j])>strlen(strArr[j+1]))

    {

    strcpy(strTemp,strArr[j]);

    strcpy(strArr[j],strArr[j+1]);

    strcpy(strArr[j+1],strTemp);

    }

    }

    }

    for(i=0;i<5;i++)

    {

    printf("%c",*(strArr[i]+2));

    }

}

//字符替换

void replace()

{

char arr[11]={"attEESeTTa"};

    int i,n=0;

    for(i=0;i

    {

    if(arr[i]=='t')

    {

    arr[i]='e';

    n++;

    }else if(arr[i]=='T')

    {

    arr[i]='E';

    n++;

    }else if(arr[i]=='e')

    {

    arr[i]='t';

    n++;

    }else if(arr[i]=='E')

    {

    arr[i]='T';

    n++;

    }

    }

    printf("\n替换为：\n");

    puts(arr);

    printf("替换的个数为：%d\n",n);

}

void Test3()

{

char strArr[7][10]={"Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"," Sunday"};

int i;

int week;

while(scanf("%d",&week))

{

if(week>0&&week<8)

{

            printf("%s\n",strArr[week-1]);

}else

{

    printf("输入不正确，请重新输入\n");

}

}

}

void main()

{

Test1();

replace();

Test3();

}