C语言读取一行输入

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fgets

char * fgets(charArray, lengthLimit, filePtr)

 	int lengthLimit = 20；
    char str1[lengthLimit];
    
    printf("Enter a sentence: ");
    fgets(str1, lengthLimit, stdin);
    int len = strlen(str1);
    
    str1[len - 1] = '';
    printf("The entered sentence is: %sn", str1);

从控制台读取键盘输入的一行，读取lengthLimit个字符或遇到换行符终止

strlen()函数：从第一个字符开始计数，直到遇到空字符’’为止，不包括’’，返回长度 17

未达长度限制时，换行符替换成终止符

达长度限制时，最后一个字符自动被替换成终止符

#include 
int main()
{
	char str[5];
	fgets(str, 5, stdin);
	for(int i = 0;i < 5; ++ i)
		{
		if(str[i] == '')
			printf("\0");
		else if(str[i] == 'n')
			printf("\n");
		else
			printf("%c",str[i]);
		}
		return 0;
}

出现异常 fgets() 函数返回NULL

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C语言中 string 就是 字符数组，尾部置 ‘’ 终止符且其不被打印

char myStr[5] = {‘a’, ’b’, ’c’, ’d’, 0};

char myStr[10]=“birdbath”;

char myStr[]=“birdbath”;

	char myWord[80];

    printf("Enter a word: ");
    
    scanf("%79s", myWord);
    myWord[79] = '';
    printf("The entered word is: %sn", myWord);

遇到空格或读取79个字符终止

#include 
#include 



int main(){
    char myWord[80];
    char mySentence[80];

    printf("Enter a word: ");
    scanf("%79s", myWord);
    myWord[79] = '';
    printf("The entered word is: %sn", myWord);

    // fflush(stdin);  // windows
    setbuf(stdin, NULL);    // linux


    printf("Enter a sentence: ");
    fgets(mySentence, 80, stdin);
    int len = strlen(mySentence);
    mySentence[len - 1] = '';
    printf("The entered sentence is: %sn", mySentence);

}