函数名: ungetch
头文件:<stdio.h>
函数原型: int ungetch(int c);
功 能: 把一个字符退回到键盘缓冲区中
参数:为要退回的字符
返回值: 成功 返回字符c ,失败 返回EOF
程序例: 将非数字的字符退回到键盘缓冲区中,并输出结果
#include<stdio.h> #include<conio.h> #include<ctype.h> int main( void ){ int i=0; char ch; puts("Input an integer followed by a char:"); while((ch = getche()) != EOF && isdigit(ch)){ i = 10 * i + ch - 48; } if (ch != EOF){ ungetch(ch); } printf("\ni = %d, next char in buffer = %c\n", i, getch()); return 0; }
运行结果
Input an integer followed by a char: d i = 0, next char in buffer = d
本文固定URL:https://www.dotcpp.com/course/533