统计文件字符信息

#include <stdio.h>
/**
@author tz
@date 2019-04-11
*/ 
void finishTask1(FILE* fptr);
void finishTask2(FILE* fptr);
void finishTask3(FILE* fptr);

int main() {
    FILE* fptr = fopen("p1.txt", "r");
    if(fptr==NULL)
        exit(0);
    printf("The result is:\n");
    finishTask1(fptr);
    rewind(fptr);
    finishTask2(fptr);
    rewind(fptr);
    finishTask3(fptr);
    rewind(fptr);
    fclose(fptr);
}

//完成Task1,统计不同类字符数量
void finishTask1(FILE* fptr) {
    printf("Task1:\n");
    int capital = 0, lowercase = 0, digit = 0, other = 0;
    int ch = fgetc(fptr);
    while (ch != EOF) {
        if (ch >= 'A'&&ch <= 'Z')
            capital++;
        else if (ch >= 'a'&&ch <= 'z')
            lowercase++;
        else if (ch >= '0'&&ch <= '9')
            digit++;
        else
            other++;
        ch = fgetc(fptr);
    }
    
    printf("capital:%d\n", capital);
    printf("lowercase:%d\n", lowercase);
    printf("digit:%d\n", digit);
    printf("others:%d\n\n", other);
}

//统计行数，行最大长度，行最小长度
void finishTask2(FILE* fptr) {
    printf("Task2:\n");
    int ch = fgetc(fptr);
    int totalLine = 0, maxLine = 0, minLine, curchars = 0, x = 0;//x用来判断是否是第一行
    while (ch != EOF) {
        while (ch != '\n') {
            curchars++;
            ch = fgetc(fptr);
            if (ch == EOF)
                break;
        }
        x++;
        if (maxLine < curchars)
            maxLine = curchars;
        if (x == 1 || minLine > curchars)
            minLine = curchars;
        totalLine++;
        curchars = 0;
        ch = fgetc(fptr);
    }
    printf("line:%d\n", totalLine);
    printf("%d characters in max line.\n", maxLine);
    printf("%d characters in min line.\n\n", minLine);
}

//输出具体的大小写字母的统计信息
void finishTask3(FILE* fptr) {
    printf("Task3:\n");
    int ch = getc(fptr), cap[26] = { 0 }, Low[26] = {0};
    int count = 0;
    //统计大小写的个数，存放在数组中 
    while (ch != EOF) {
        if (ch >= 'A'&&ch <= 'Z') {
            cap[ch - 'A']++;
        }
        if (ch >= 'a'&&ch <= 'z') {
            Low[ch - 'a']++;
        }
        ch = getc(fptr);
    }
    //依次输出 
    printf("CAPITAL:\n");
    while (count != 26) {
        if ((count + 1) % 4 == 0)
            printf("%c:%d\n", 'A' + count, cap[count]);
        else
            printf("%c:%d    ", 'A' + count, cap[count]);
        count++;
    }
    printf("\n");
    count = 0;
    printf("LOWERCASE:\n");
    while (count != 26) {
        if ((count + 1) % 4 == 0)
            printf("%c:%d\n", 'a' + count, Low[count]);
        else
            printf("%c:%d    ", 'a' + count, Low[count]);
        count++;
    }
    printf("\n");
}