// lib_printf.c
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
char icVal = 117;
int i_Val = 16777217;
long long iLVal = 12345678912345678;
float f_Val = -4325.25;
double fdVal = 1.81794E-3;

int* ptrIVal = &i_Val;
printf("\\n*** Tests de printf() ***\\n");
printf("Valeur char avec d = %d\n",
icVal);
printf("Valeur char avec c = %c\n",
icVal);
printf("\n*** Tests de cadrage sur int
***\n");
printf("Valeur int avec d = |%d|||\n",
i_Val);
printf("Valeur int avec -12d =
|%-12d|||\n", i_Val);
printf("Avec 12d et signe + =
|%+12d|||\n", i_Val);
printf("Ligne de reperage =
|****99999999|||\n");
printf("16300 en hexadecimal = |%X|\n",
16300);
printf("Valeur long long =
|%llu|||\n", iLVal);
printf("\n*** Tests de cadrage sur float
***\n");
printf("Valeur float avec f =
|%f|||\n", f_Val);
printf("Valeur int avec 5.1f =
|%5.1f|||\n", f_Val);
printf("Valeur int avec 3.5f =
|%3.5f|||\n", f_Val);
printf("\nValeur double avec e =
|%e|||\n", fdVal);
printf("Valeur double avec f =
|%f|||\n", fdVal);
printf("Valeur double avec 5.9f =
|%5.1f|||\n", fdVal);
printf("\n*** Tests de cadrage sur
tableaux chaines\n");
printf("Valeur chaine avec s =
|%s|||\n", stVal);
printf("Valeur chaine avec 30s =
|%30s|||\n", stVal);
printf("Valeur chaine avec -10s =
|%-10s|||\n", stVal);
printf("\n*** On finit avec un pointeur
***\n");
printf("Valeur de pointeur avec p =
|%p|\n", ptrIVal);
printf("Contenu de cette adresse =
|%d|\n", *ptrIVal);
return 0;
}

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Read inputs from stdin

OneCompiler's C online editor supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample C program which takes name as input and print your name with hello.

#include <stdio.h>
int main()
{
    char name[50];
    printf("Enter name:");
    scanf("%s", name);
    printf("Hello %s \n" , name );
    return 0;
    
}

About C

C language is one of the most popular general-purpose programming language developed by Dennis Ritchie at Bell laboratories for UNIX operating system. The initial release of C Language was in the year 1972. Most of the desktop operating systems are written in C Language.

Key features:

  • Structured Programming
  • Popular system programming language
  • UNIX, MySQL and Oracle are completely written in C.
  • Supports variety of platforms
  • Efficient and also handle low-level activities.
  • As fast as assembly language and hence used as system development language.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition if-else is used.

if(conditional-expression) {
   // code
} else {
   // code
}

You can also use if-else for nested Ifs and if-else-if ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to if-else-if ladder.

switch(conditional-expression) {    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
...    
    
default:     
 // code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  // code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while(condition) {  
 // code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {
  // code 
} while (condition);

Arrays

Array is a collection of similar data which is stored in continuous memory addresses. Array values can be fetched using index. Index starts from 0 to size-1.

Syntax

One dimentional Array:

data-type array-name[size];

Two dimensional array:

data-type array-name[size][size];

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity.

Two types of functions are present in C

  1. Library Functions:

Library functions are the in-built functions which are declared in header files like printf(),scanf(),puts(),gets() etc.,

  1. User defined functions:

User defined functions are the ones which are written by the programmer based on the requirement.

How to declare a Function

return_type function_name(parameters);

How to call a Function

function_name (parameters)

How to define a Function

return_type function_name(parameters) {  
  //code
}