c - 为什么我在打印计数值之前在这里换行？

Question

这是我的代码。这是我想要的输出:

Occurrence of 'l' in Hello world = 3

但是我在 hello world 之后换了一行。我该如何解决这个问题？

#include<stdio.h>
#include<string.h>
int main (void){
    char first_line[1000];
    char second_line[2];
    int i,n,j;
    int count=0,flag=0;
    fgets(first_line, 1000, stdin);
    fgets(second_line, 2, stdin);
    for(i=0; i<strlen(first_line); i++)
    {
        if(second_line[0]==first_line[i])
        {
            flag=1;
            count++;
        }
    }
    if(flag==1)
        printf("Occurrence of '%c' in %s = %d",second_line[0],first_line,count);

    else
        printf("%c isn't present",second_line[0]);

    return 0;
}

Answer 1

根据C标准中函数fgets的描述(7.21.7.2 fgets函数)

2 The fgets function reads at most one less than the number of characters specified by n from the stream pointed to by stream into the array pointed to by s. No additional characters are read after a new-line character (which is retained) or after end-of-file. A null character is written immediately after the last character read into the array.

例如，要删除换行符，您可以编写

first_line[ strcspn( first_line, "\n" ) ] = '\0';