Tài liệu Bài giảng Tin học đại cương A (dành cho khối tự nhiên):Input and Output

Input & Output Nguyen Dung Faculty of IT - College of Science Functions I/O stdio.h Input: scanf gets getch getchar Output printf puts putch scanf printf gets puts … conio.h getch getchar putch … Output - printf List arguments int printf (const char *format [,argument,…]) string (plain text) Format string format specifier %[flags][width][.prec]type_char %[flags][width][.prec] type_char Code Out put d Integer number u Unsigned integer ld Long integer lu Unsigned long integer o Octal x, X Hexa f Real number: float, double E, e Real number: float, double G, g Real number: floar, double c Character: char s String: array char p Address Different??? %[flags][width][.prec] type_char int x = 5; float y = 10; printf(“x = %d, y = %f, z = %d”, x, y, x + y); x = 5, y = 10, z = 15 %[flags][width][.prec]type_char Flag Description - Align left + Display sign of number white space Display sign of negative number None Align right Width Description Precision Description n Minimum number of characters to be printed .number The minimum number of digits to be written * Get from parameter .* Get from parameter None Depend on number input None Depend on number input %[flags][width][.prec]type_char int x = -45; int y = 15; printf("x = %d\n",x); printf("y = %d\n",y); printf("y = %+d\n",y); printf("x = %5d\n",x); printf("x = %-5d\n",x); printf("y = %5d\n",y); x y y x x y = = = = = = -45 15 +15 -45 -45 15 %[flags][width][.prec]type_char int x = -145; float y = -10.13596; printf("x = %010d\n",x); printf("y = %7.2f\n",y); printf("y = %12.5f\n",y); printf("-y= %012.5f\n",-y); printf("y = %-3.3f\n",y); printf("y = %*.*f\n",8,3,y); x = -000000145 y = -10.14 y = -10.13596 -y= 000010.13596 y = -10.136 y = -10.136 Output – putch, puts int putch(int ch) int puts(const char *s) char ch=„a‟; putch(ch); putch(68); puts(“hello world!”); a D helloworld! _ In - scanf int scanf(const char *format [, address,…]); int x,y; printf(“Enter x,y: "); scanf("%d %d",&x,&y); printf("x = %d\ny = &d",x,y); Enter x, y: 10_4 x = 10 y = 4_ In - gets gets(char *s) Micheal Balack Name is: Micheal Balack char name[30]; gets(name); printf(“Name is: %s”,name); But Micheal Balack Name is: Micheal char name[30]; scanf(“%s”,name); printf(“Name: %s”,name); In – getch, getchar int getchar(void); int getch(void); Input a character: c Character is entered: c int ch; printf(“Input a character: ”); ch = getchar(); printf(“Character is entered: %c”,ch); Different: getchar – display the character entered. getch – don‟t display. Exercises Available: nguyendung622.wordpress.com Dealline: 19h before the learning day of next week. Send to: [email protected] The end