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);
}
