#include<stdio.h>

#include<string.h>

int demkituthuong(char *s);

int demkituhoa(char *s);

char *daoxau(char *s);

int main()

{

char s[255];

printf("Nhap xau:");

gets(s);

printf("Xau vua nhap:%s

",s);

printf("So ki tu thuong trong xau:%d

",demkituthuong(s));

printf("So ki tu hoa trong xau:%d

",demkituhoa(s));

printf("Xau dao nguoc:%s

",daoxau(s));

system("pause");

return 0;

}

int demkituthuong(char *s)

{

int n=strlen(s);

int i,dem=0;

for(i=0;i<n;++i)

if(s[i]>='a'&&s[i]<='z')dem++;

return dem;

}

int demkituhoa(char *s)

{

int n=strlen(s);

int i,dem=0;

for(i=0;i<n;++i)

if(s[i]>='A'&&s[i]<='Z')dem++;

return dem;

}

char *daoxau(char *s)

{

char *s1=strdup(s);

strrev(s1);

return s1;

}