就是讀文章，算裡面Ａ有幾個Ｂ有幾個一直到Ｚ有幾個，然後大小寫沒差。
第一行要給出文章有幾行，恩，大概就這樣，使用switch來寫，可能不好看。 QQ
範例：
#include<iostream>
#include<fstream>
#include<string>
using namespace std;
void compare(string k,int a[]);
int main()
{
fstream myfile;
myfile.open("test.txt");
int alph[26];
for(int i=0;i<26;i++)
alph[i]=0;
int n;
string t;
myfile >> n;
for(int i=0;i<n+1;i++)
{
getline(myfile,t);
for(int i=0;i<t.length();i++)
t[i]=tolower(t[i]);
compare(t,alph);
}
cout << "a " << alph[0]<<endl;
cout << "b " << alph[1]<<endl;
cout << "c " << alph[2]<<endl;
cout << "d " << alph[3]<<endl;
cout << "e " << alph[4]<<endl;
cout << "f " << alph[5]<<endl;
cout << "g " << alph[6]<<endl;
cout << "h " << alph[7]<<endl;
cout << "i " << alph[8]<<endl;
cout << "j " << alph[9]<<endl;
cout << "k " << alph[10]<<endl;
cout << "l " << alph[11]<<endl;
cout << "m " << alph[12]<<endl;
cout << "n " << alph[13]<<endl;
cout << "o " << alph[14]<<endl;
cout << "p " << alph[15]<<endl;
cout << "q " << alph[16]<<endl;
cout << "r " << alph[17]<<endl;
cout << "s " << alph[18]<<endl;
cout << "t " << alph[19]<<endl;
cout << "u " << alph[20]<<endl;
cout << "v " << alph[21]<<endl;
cout << "w " << alph[22]<<endl;
cout << "x " << alph[23]<<endl;
cout << "y " << alph[24]<<endl;
cout << "z " << alph[25]<<endl;
system("pause");
return 0;
}
void compare(string k,int a[])
{
for(int i=0;i<k.length();i++)
{
switch(k[i])
{
case 'a':
a[0]++;
break;
case 'b':
a[1]++;
break;
case 'c':
a[2]++;
break;
case 'd':
a[3]++;
break;
case 'e':
a[4]++;
break;
case 'f':
a[5]++;
break;
case 'g':
a[6]++;
break;
case 'h':
a[7]++;
break;
case 'i':
a[8]++;
break;
case 'j':
a[9]++;
break;
case 'k':
a[10]++;
break;
case 'l':
a[11]++;
break;
case 'm':
a[12]++;
break;
case 'n':
a[13]++;
break;
case 'o':
a[14]++;
break;
case 'p':
a[15]++;
break;
case 'q':
a[16]++;
break;
case 'r':
a[17]++;
break;
case 's':
a[18]++;
break;
case 't':
a[19]++;
break;
case 'u':
a[20]++;
break;
case 'v':
a[21]++;
break;
case 'w':
a[22]++;
break;
case 'x':
a[23]++;
break;
case 'y':
a[24]++;
break;
case 'z':
a[25]++;
break;
}
}
}
達人
