Question

该程序从名为＆＃34; input.txt＆＃34;的文件中获取输入。但它没有输出正确的外观和说顺序。该程序应输入21和114421.输出应为1211和21241211，但它只是给我无意义的数字。

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[]){
    char input[1024];      //The input element
    char result[1024];     //The next element
    int length = 0;        //The length of the input
    int resultLength = 0;  //The length of the result
    FILE *openFile;
    openFile = fopen("input.txt", "r");



    do{
        fgets(input, 1024, openFile);
    } while((input[length++] != '.') && (!feof(openFile)));
    length -= 1; //Decrement length because of the length++ that just executed

    //Go through the loop, adding to the result each time the chain stops

    fclose(openFile);
    char prev = input[0];   //The previous character
    int count = 1;          //The count in the current chain
    int i, j = 0;
    for(i=1; i < length; i++){
        if(input[i] == prev){
            count++;   //If the chain is unbroken, increment the count
        } else{
            //If the chain breaks, store the count and digit in result and reset count
            result[j++] = count + '0';
            result[j++] = prev;
            count = 1;
        }

        //Set prev to be the current digit
        prev = input[i];
    }

    //Handle the last digit using the current value of count and prev
    result[j++] = count + '0';
    result[j++] = prev;

    //Print out the result
    printf("The next element in the sequence is: ");
    resultLength = j;
    for(i=0; i < resultLength; i++){
        printf("%c", result[i]);
    }
    printf("\n");

    system("pause");


    return 0;
}

Answer 1

像这样修复

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(void){
    char input[1024];
    char result[2*sizeof(input)];
    int length = 0;// The length of the input
    FILE *openFile = fopen("input.txt", "r");

    if(!openFile){
        perror("fopen:");
        exit(EXIT_FAILURE);
    }

    while(fgets(input, 1024, openFile)){
        char *p = strchr(input, '\n');
        if(!p){
            fprintf(stderr, "Input too long!\n");
            exit(EXIT_FAILURE);
        }
        *p = 0;//chomp newline
        length = p - input;
        if(*input == '.' && !input[1]){
            puts("c u!");
            return 0;
        }
        //conversion
        int resultLength = 0;
        int i, j;
        for(i = 0; i < length; i = j){
            int count = 1;
            for(j = i + 1; input[i] == input[j]; ++j)
                ++count;//Count of repeated characters

            while(count > 9){//Processing when the count exceeds 9 E.g 111111111111 ==> 9131
                result[resultLength++] = '9';
                result[resultLength++] = input[i];
                count -= 9;
            }
            result[resultLength++] = count + '0';
            result[resultLength++] = input[i];
        }
        result[resultLength] = 0;//Add NUL charancter to last for %s of printf

        //Print out the result
        printf("The next element in the sequence is: %s\n", result);
    }
    fclose(openFile);
    return 0;
}

看，并说序列程序没有输出正确的序列

1 个答案: