程序代码：

#include<iostream> 
#include<cctype> 
using namespace std; 
void del_punct(char *str) 
{ 
        int i, j; 
 
        for (i = j = 0; str[i] != '\0'; i++) { 
                if (!ispunct(str[i])) { 
                       str[j++] = str[i]; 
                } 
        } 
        str[j] = '\0'; 
} 
 
int main()
{ 
    char a[30]; 
    cin.getline(a,30); 
    cout<<a<<endl; 
 
    del_punct(a); 
    cout<<endl; 
    cout<<a<<endl; 
    return 0; 
    system("pause"); 
}