中国铁道建设出版
}
cout<<a[i][j]<<'\t'; b[i][j]=a[i][j]*a[i][j]; } cout<<endl; } cout<<endl; cout<<"数组b为：\n"; for(i=0;i<3;i++){ for(int j=0;j<4;j++) cout<<b[i][j]<<'\t'; cout<<endl; } cout<<endl;
//5. 小写字母改写为大写字母
#include<iostream.h>
void main()
{
}
char str[100]; cout<<"请输入一个含空格字符的字符串。\n"; cin.getline(str,100); for(int i=0;str[i];i++) if(str[i]>='a'&&str[i]<='z') str[i]-='a'-'A'; cout<<"转换后的字符串为：\n"; cout<<str<<"\n";
//6. 通过指针将字符串逆序
#include<iostream.h>
#include<string.h>
void main()
{
char str[]="abc321",*s1=str,*s2,ch; cout<<"原字符串为：\n"<<s1<<endl; s2=str; while(*s2)s2++; s2--; while(s1<s2){ ch=*s1; *s1=*s2; *s2=ch; //A //B