Chapter 3: I/O Management

printf() and scanf() function printf() and scanf() function are used as basic I/O function. printf syntax: printf(string, expression1, expression2, ……) No limit on number of value can be that can be printed Format string may contain ordinary character and conversion specification begin with % Conversion specifier specifies compiler to convert into specific format. Though compiler doesn’t check the conversion specification number should match.

Why following printf() is wrong printf(“%d %d”, i); printf(“ %d”, i, j); int i; float x; printf(“%f %d\n”,i,x);

Conversion Specifier d  deimal e  floating point is exponential f  Display floating point number c  character s  string %.1f  display float value with one digit decimal %4d  display with space in front (Right justification) %-4d  display with space in back (Left Justification)

Example

Escape Sequence Non printing character having special meaning Start with \ Some common escape sequence are

The scanf() function Takes input from user, Syntax scanf(“string ”, &variable, &variable, ………..) Never FORGET to use & before variable Confusing printf() and scanf() …

Input fraction

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