#c_language

[govindiem]

Lecture 4 C language Tutorial | Variables in C | What is C Variable | Le...

[nintedu-blog]

GCC 9 vs. Clang 8 C/C++ Compiler Performance On AMD Threadripper, Intel Core i9

                                          https://nintedu.com

Since the discharge of the GCC nine stable compiler suite earlier this month we've begun firing up variety of compiler benchmarks for this annual feature update to the wildebeest  Compiler assortment. For your viewing pleasure nowadays is watching the performance of GCC eight against GCC nine compared to LLVM Clang eight because the latest unleash of this friendly ASCII text file compiler competition. This GCC eight vs. GCC 9 vs. Clang eight C/C++ compiler benchmarking was done on associate Intel Core i9 7980XE and AMD Ryzen Threadripper 2990WX high-end desktop/workstation systems.

Both the Intel Core i9 and AMD Ryzen Threadripper systems were running Ubuntu eighteen.04.2 LTS with the UNIX operating system four.18 kernel. GCC 8.3.0 and GCC nine.1.0 were freshly inbuilt their unleash modes and for this compiler benchmarking article was simply watching the C/C++ performance for comparison to LLVM Clang, that was tested mistreatment its stable eight.0.1 release. this text is not regarding watching the Core i9 vs. Threadripper performance the maximum amount because it is watching the GCC eight vs. GCC 9 vs. Clang eight performance on the current-generation Intel and AMD microarchitecture targets.

While benchmarking the 3 compilers on the 2 systems, the CFLAGS/CXXFLAGS were set to "-O3 -march=native" for watching the optimized code generated performance on these systems. The systems state were maintained throughout take a look ating apart from dynamic  out the compiler beneath test. All of those compiler benchmarks were expedited during a fully-automated manner mistreatment the ASCII text file Phoronix take a look at Suite benchmarking software system.

Some complementary knowledge points watching the GCC nine compiler tuning/optimization performance on these systems among alternative benchmarks are bobbing up on Phoronix within the days ahead at the side of watching the GCC nine compiler performance on AArch64 and POWER9.

[admeci]

Working with All Types of Loops in C Language

C language is a programming language which is developed by Dennis Ritchie. It is the very first language which is easy to understand for human and middle-level language.

C has many features which makes it popular and still in the competition after introducing many new languages like Java, Python, .net, Perl etc.

It is used to create the compilers and operating systems. Loops are very important to understand you must focus on the topic while your C language training course from any training institute.

In this blog we are going to talk about loops, its types and their work.

Different Types of Loops in C

Loops are of three types namely:

for loop

while loop

do-while loop

A loop is a block of code which will repeat that execution of the code itself until the condition becomes false.

1. for loop

In for loop the loop runs until the condition is not false. We can say that it is a single statement loop because in a single statement it takes three parameters and that is the initialization of the variable, condition which decides that how many times the code will execute and the third parameter is the updation of the variable after each iteration.

Here is the Syntax of 'for loop':

for(intialization of variable; condition to check; increment or decrement variable)

{

executes the code until the condition is not false

}

To use for loop it is mandatory to use 'for' keyword. After using the keyword for, we initialize the variable by giving it the initial value. Then condition will specify which helps to terminate the loop. Then we update the variable which we initialize in starting. Semicolon is used to differentiate between different parameters.

Illustration of for loop:

#include<stdio.h>

void main()

{

int i;

for (i=0; i<=10; i++)

  {

         printf("%d\n",i);

   }

}

2. while loop

While loop is a loop which executes the lines of code until the condition becomes false. This is different from for loop as it accepts one parameter only which specify the condition.

Syntax of while loop:

variable initialization;

while(condition)

{

   statements;

   variable increment or decrement;

}

 In case of while loop, initialization is done before using while keyword and Updation of that variable are done after using the while keyword.

Example of while loop:

#include<stdio.h>

void main( )

{

   int x;

   x = 1;

   while(x <= 10)

   {

       printf("%d\t", x); 

       x++;

   }

}

3. do…while Loop

It is a loop which is used to execute the statements at least once whether condition becomes true or false. We add a condition in the loop at the last of it.

Syntax of do…while Loop:

do {

        statements;

} while ( condition );

The major difference between while and do while is that statements of while loop is executed when the condition is true whereas statements of do while loop executes at least once whether the condition is true or not.

Illustration of do while loop:

#include<stdio.h>

int main()

{

int i;

i=0;

do

  {

         printf("Hello admec\n");

  }

}while(i!=0)

We can use nested loops means many loops within a loop. If we give an incorrect condition then this may result in the execution of loop infinite times.

We can control the flow of loop using two statements like break and continue statements.

Example of a loop which executes infinite time:-

#include <stdio.h>

int main () {

  for( ; ; ) {// this statement is possible in C

     printf("This loop will run forever.\n");

  }

  return 0;

}

Similar Blog: Loops in C and C++

Note:

1. Loops are better than recursive functions as they take less memory so boost performance.

2. Never calculate length of an array or any iterate object in the loop to improve the performance

Loops are the basics of every language. By using loops you can reduce the length of the code and complexity of your program. To know more interesting facts about loops, Keep on learning with practice. You should join a reputed Institute for the proper guidance like ADMEC Multimedia Institute.