单词长度统计，字符数量统计直方图

1. 打印输入中单词长度

2. 打印输入中各个字符出现频度的直方图

#include <stdio.h>
#include <Conio.h>
#include <stdlib.h>
#define IN 1
#define OUT 0
main()
{
    int nc, nw, count, state, input;
    int nclist[26];
    
    for (int i = 0; i< 26; ++i){
        nclist[i] = 0;
    }
    
    nc = nw = count = 0;
    int* nwlist = (int*)calloc(nw,sizeof(int));
    state = OUT;
    while((input=getchar())!=EOF){
        ++nc;
        ++nclist[input-'a'];
        if (state == IN){
            nwlist [nw-1] = ++count;
        }
        if(input == ' ' || input == '	'|| input == '
'){
            state = OUT;
            count = 0;
        }else if(state == OUT){
            state = IN;
            ++nw;
            nwlist = (int *)realloc(nwlist, 1*sizeof(int));
        }
    }
    printf("************below is word length details***********
");
    for(int i = 0; i < nw; ++i){
        printf("%d
",nwlist[i]);
    }
    printf("************below is character details************
");
    for(int i = 0; i < 26; ++i){
        printf("%c: ", ('a'+ i));
        for(int j = 0; j< nclist[i]; ++j){
            printf("*");
        }
        printf("
");
    }
    getch();     
}

结果：

tips:

C语言中数组动态分配int* a=(int*)calloc(n,sizeof(int));//n是数组的大小。

需要导入<stdlib.h>包。本例在不考虑效率的情况下也可以申请一个足够大的数组。