1 C standard output (printf(), puts() and putchar()) The printf() function sends a formatted string to the standard output (the display). This string can display formatted variables and special control characters, such as new lines ('\n'), backspaces ('\b') and tabspaces ('\t'); these are listed in Table 2.1.
Example 1: C Output
The printf() is a library function to send formatted output to the screen. The function prints the string inside quotations. To use printf() in our program, we need to include stdio.h header file using the #include <stdio.h> statement.
Print Function in C, C++, and Python
Print function is used to display content on the screen.
%d and %f are format specifiers. %d is used for integer(-3,-100,3,100,etc). And %f is used for float(10.6,-39.0,etc).
%s refers to a string %d refers to an integer %c refers to a character. Therefore: %s%d%s%c\n prints the string "The first character in sting ", %d prints i, %s prints " is ", and %c prints str[0].
using printf()
If we want to do a string output in C stored in memory and we want to output it as it is, then we can use the printf() function. This function, like scanf() uses the access specifier %s to output strings. The complete syntax for this method is: printf("%s", char *s);
Printf() and Scanf() are inbuilt library functions in C language that perform formatted input and formatted output functions. These functions are defined and declared in stdio. h header file. The 'f' in printf and scanf stands for 'formatted'.
An output function is a function that an optimization function calls at each iteration of its algorithm. Typically, you use an output function to generate graphical output, record the history of the data the algorithm generates, or halt the algorithm based on the data at the current iteration.
Master C and Embedded C Programming- Learn as you go
Generally, printf() function is used to print the text along with the values. If you want to print % as a string or text, you will have to use '%%'. Neither single % will print anything nor it will show any error or warning.
The escape sequence \n means newline. When a newline appears in the string output by a printf, the newline causes the cursor to position to the beginning of the next line on the screen.
Explanation: int a=250; The variable a is declared as an integer type and initialized to value 250. printf("%1d \n", a); It prints the value of variable a. Hence the output of the program is 250.
In C programming language, scanf is a function that stands for Scan Formatted String. It reads data from stdin (standard input stream i.e. usually keyboard) and then writes the result into the given arguments. It accepts character, string, and numeric data from the user using standard input.
The scanf function reads input from the console and parses it. It has no means of printing anything.
In the above syntax str_name is any name given to the string variable and size is used to define the length of the string, i.e the number of characters strings will store.
We can print the string using %s format specifier in printf function. It will print the string from the given starting address to the null '\0' character. String name itself the starting address of the string. So, if we give string name it will print the entire string.
The print() function writes, i.e., "prints", a string or a number on the console. The return statement does not print out the value it returns when the function is called.
Example 1: C++ printf()
In this program, we have used the printf() function to print the integer num and the C-string my_name . printf("num = %d \n", num); printf("My name is %s", my_name); Here, %d is replaced by the num variable in the output.
This number is stored in the number variable. printf("Enter an integer: "); scanf("%d", &number); Finally, the value stored in number is displayed on the screen using printf() . printf("You entered: %d", number);
printf("I like %c%s", 'C', " very much!"); %c Character %s String of characters To print an individual character, use %c. This causes its matching argument to be output, unmodified, to the screen. To print a string, use %s.