[英]Using 'fgets' to read in a char is just skipping when running
問題是在read_in函數中,當我使用fgets讀取樂隊/歌手的用戶輸入時,它將跳過此行。 我不知道為什么會這樣? 之前我確實使用過scanf,但是問題是,如果在輸入帶空格的樂隊名稱(例如“ foo fighters”)時這樣做,它將跳過參考行的下一個打印名稱。 有人知道怎么修這個東西嗎?
#include <stdio.h>
#include <conio.h>
#define MAX 1000`enter code here`
int exit = 0; // Declaring a global variable
struct data { // using struct to put the data in an arrays
char band [48], cd [48], ref [16];
float cost;
int year;
} cata [MAX]; // declaring a struct variable
int read_in ( void )
{
int i = 0;
printf("\n");
while ( exit != 2 ) // while exit != 2 then ask the user to enter the information
{
printf("\nPlease Enter the Name of Band/Singer: ");
fgets(cata[i].band, 48, stdin);
printf("\nPlease Enter the Name of CD: ");
scanf("%s", &cata[i].cd);
printf("\nPlease Enter the Name of the Reference: ");
scanf("%s", &cata[i].ref);
printf("\nPlease Enter the cost: ");
scanf("%f", &cata[i].cost);
printf("\nPlease Enter the Year of Release: ");
scanf("%d", &cata[i].year);
printf("\nWrite another CD: [1] \nMain Menu: [2]\nYour choice: "); // Asking him a choice either write another one or go back to menu
scanf("%d", &exit);
i++;
}
exit = 0;
return i;
}
void print_out (void)
{
FILE *file_cata;
int i = 0;
printf("\n");
while ( exit != 2 )
{
file_cata = fopen ("catalogue.txt", "r"); // open the file and read
if (file_cata == NULL)
{
printf("Error: can't open files.\n");
}
else
{
while (!feof (file_cata))
{
fgets(cata[i].band, MAX , file_cata); // it will scanf the file and get the string and then print it out on screen
printf("%s", cata[i].band);
fgets(cata[i].cd, MAX, file_cata);
printf("%s", cata[i].cd);
fgets(cata[i].ref, MAX, file_cata);
printf("%s", cata[i].ref);
fscanf(file_cata, "%.2f" , cata[i].cost);
fscanf(file_cata, "%d", cata[i].year);
i++;
}
}
fclose (file_cata); // close file
printf("Read it again: [1] \nMain Menu: [2]\nYour choice: ");
scanf("%d", &exit);
}
exit = 0;
}
void save ( int num )
{
FILE *file_cata;
int i = 0;
printf("\n");
while ( exit != 2 )
{
file_cata = fopen ("catalogue.txt", "a"); // file append, so it will write at the end of the file
if (file_cata == NULL)
{
printf("Error: can't open files. \n");
}
else
{
while (i != num)
{
fprintf( file_cata, "\n");
fprintf( file_cata, "The name of Band/Singer: %s \n", cata[i].band);
fprintf( file_cata, "The name of CD: %s \n", cata[i].cd);
fprintf( file_cata, "The name of Reference: %s\n", cata[i].ref);
fprintf( file_cata, "The Cost: %.2f \n", cata[i].cost);
fprintf( file_cata, "The Year of Release: %d \n", cata[i].year);
i++;
}
}
fprintf( file_cata, "\n");
fclose (file_cata);
printf("Your data has been saved to the catalogue.\n\n");
printf("Save it again: [1] \nMain Menu: [2]\nYour Choice: ");
scanf("%d", &exit);
}
exit = 0;
}
void main ()
{
int num1 = 0;
int option = 0;
while ( option != 4 )
{
printf("The following options are availlable: \n");
printf("Read in data [1] \n");
printf("Print out catalogue to screen [2] \n");
printf("Save data to file [3] \n");
printf("Exit Program [4] \n");
printf("Enter your choice now: ");
scanf( "%d", &option);
if (option == 1)
num1 = read_in ();
if (option == 2)
print_out ();
if (option == 3)
save(num1);
printf("\n");
}
printf("\n*** Your program will end when you press ANY button. ***\n");
_getch();
}
scanf
將換行符保留在輸入緩沖區中。 一個很好的答案的相關問題(提示:不要使用scanf
;始終使用fgets
,如果必須以這種方式轉換的話還要使用sscanf
。): 替換fflush(stdin)
這將刷新輸入緩沖區,您應該在嘗試讀取另一行(從上面的答案中竊取)之前執行此操作:
while((c = getchar()) != '\n' && c != EOF)
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