程序代码：

#include<stdio.h>
#include<string.h>
void main()
{
    char a[100];
    int i,j,k,n;
    gets(a);
    n=strlen(a);
    for(i=0;i<=n;i++)
        for(j=i;j<n;j++)
        {
            for(k=i;k<=j;k++)
                printf("%c",a[k]);
            printf("\n");
        }
}

程序代码：

#include<stdio.h>

/**

 *\brief 递归

 */
static void f(unsigned char *p_chr, unsigned int idx)
{
    unsigned char *p_tmp = p_chr;
    unsigned int i = 0;
    
    while (*p_tmp != '\0' && *(p_tmp + idx - 1) != '\0'){
        
        for (i = 0; i < idx; ++i){
            
            printf("%c", *(p_tmp+i));
        }
        printf("\n");
        ++p_tmp;
    }
    
    if (*p_chr != '\0' && *(p_chr + idx) != '\0'){
        
        f(p_chr, idx+1);
    }
}

int main(void)
{
    unsigned char a[100] = {0};
    
    scanf("%s", a);
    
    f(a, 1);

    return 0;
}