2020-04-07

学习了字符串数组,

1.

#include<stdio.h>

#include<string.h>

int main(){

int i;

char a[80]={"If so, you already have a Google Account. You can sign in on the right."};

for(i=0;i<80;i++){

if(a[i]>='A'&&a[i]<='Z'){

a[i]+=32;

}else if(a[i]>='a'&&a[i]<='z'){

a[i]-=32;

}

}

printf("转换后:%s",a);

}

2.

#include<stdio.h>

#include<string.h>

int main(){

int i;

int n1;

int n2;

int n3;

int n4;

char a[255]={};

printf("请输入一串字符:");

scanf("%s",&a);

int sum1=0;

int sum2=0;

int sum3=0;

int sum4=0;

for(i=0;i<255;i++){

if(a[i]>='0'&&a[i]<='9'){

sum1++;

}else if(a[i]>='a'&&a[i]<='z'){

sum2++;

}else if(a[i]>='A'&&a[i]<='Z'){

sum3++;

}else{

sum4++;

}

}

printf("数字:%d",sum1);

printf("小写字母:%d",sum2);

printf("大写字母:%d",sum3);

printf("其他:%d",sum4);

}

3.

#include<stdio.h>

#include<string.h>

int main(){

int i;

char A;

char B;

char a[200]={"\0"};

printf("请输入一串字符:");

gets(a);

printf("请输入转化字符:");

scanf("%c %c",&A,&B);

for(i=0;i<strlen(a);i++){

if(a[i]==A){

a[i]=B;

}

}

printf("转换后:%s",a);

}