#include <stdio.h> #include <omp.h> #include <math.h> #define N 20
int main()
{
printf("Kishika Malhotra \n 20BCE0592 \n\n");
int A[20] = {10, 112, 124, 178, 15, 255, 489, 687, 357, 148, 100, 144, 178, 93, 44, 176, 5, 6, 305,
212};
int i;
double start, end, total; omp_set_num_threads(10);

#pragma omp parallel private(A)
{
start = omp_get_wtime(); printf("Array elements are:\n"); for (i = 0; i < N; i++)
{
printf("Element %d is %d\t\n", i + 1, A[i]);
}
end = omp_get_wtime(); total = end - start;
printf("The execution time for printing array elements is %f", total);

start = omp_get_wtime(); printf("\n");
printf("\nMultiplying with a value and printing:\n");

for (i = 0; i < N; i++)
{
printf("Element %d is %d\t\n", i + 1, (2 * A[i]));
}
end = omp_get_wtime(); total = end - start;
printf("The execution time for multipluing and printing array elements is %f\n\n", total);

start = omp_get_wtime();
int evensum = 0, oddsum = 0, totalsum = 0; for (int i = 0; i < N; i++)
{
if (A[i] % 2 == 0)
{
evensum += A[i];
}
else
{
oddsum += A[i];
}
}
totalsum = evensum + oddsum;
printf("Even sum of array elements is:%d\n", evensum); printf("Odd sum of array elements is:%d\n", oddsum); printf("Total sum of array elements is:%d\n", totalsum); end = omp_get_wtime();
total = end - start;
printf("The execution time for finding sum is %f\n\n", total);

start = omp_get_wtime(); int evencount = 0,
oddcount = 0;
for (int i = 0; i < N; i++)
{
if (A[i] % 2 == 0)
{
evencount += 1;
}
else
{
oddcount += 1;
}
}
printf("No of Even elements are %d\n", evencount); printf("No of Odd elements are %d\n", oddcount); end = omp_get_wtime();
total = end - start;
printf("The execution time for finding count is %f\n\n", total); start = omp_get_wtime();

int squaresum = 0, cubesum = 0, temp, temp1; for (int i = 0; i < N; i++)
{
temp = 0;
temp1 = 0;
temp = A[i] * A[i]; temp1 = temp * A[i]; squaresum += temp; cubesum += temp1;
}
printf("Sum of Square of array elements is %d\n", squaresum); printf("Sum of Cube of array elements is %d\n", cubesum); end = omp_get_wtime();
total = end - start;
printf("The execution time for finding square and cube sum is %f\n\n", total);

start = omp_get_wtime(); int max, min;
max = A[0];
for (i = 1; i < N; i++)
{
if (A[i] > max)
{
max = A[i];
}
}
printf("The max value of the array element is %d\n", max); min = A[0];
for (i = 1; i < N; i++)
{
if (A[i] < min)
{
min = A[i];
}
}
printf("The min value of the array element is %d\n", min); end = omp_get_wtime();
total = end - start;
printf("The execution time for finding max and min values is %f\n", total);
}
}

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Read inputs from stdin

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#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
}