include<stdio.h>

void currencyConvert(int value){
    float dollorValue;
    printf("Enter how much dollor you have\t");
    scanf("%f" , &dollorValue);
    switch (value)
    {
    case 1:
        printf("Euro(EUR) value of %0.2f dollor is %0.2f " , dollorValue , (dollorValue*0.99));
        break;
    case 2:
        printf("Pound Sterling(GBP) value of %0.2f dollor is %0.2f " , dollorValue , (dollorValue*0.86));
        break;

    case 3:
        printf("Australian Dollor(AUD) value of %0.2f dollor is %0.2f " , dollorValue , (dollorValue*1.53));
        break;

    case 4:
        printf("Canadian Dollor(CAD) value of %0.2f dollor is %0.2f " , dollorValue , (dollorValue*1.34));
        break;

    case 5:
        printf("Swiss Franc(CHF) value of %0.2f dollor is %0.2f " , dollorValue , (dollorValue*0.98));
        break;
    case 6:
        printf("Indian Rupee(INR) value of %0.2f dollor is %0.2f " , dollorValue , (dollorValue*81.31));
        break;
    default:
        printf("Please enter valid input");
        break;
    }
}

int main(){
    printf("Currency Converter..........");
    int userInput , select;
again:
    printf("Select option .......\n");
    printf("1. Dollor to Euro(EUR)\n");
    printf("2. Dollor to Pound Sterling(GBP)\n");
    printf("3. Dollor to Australian Dollor(AUD)\n");
    printf("4. Dollor to Canadian Dollor(CAD)\n");
    printf("5. Dollor to Swiss Franc(CHF)\n");
    printf("6. Dollor to Indian Rupee(INR)\n");
    scanf("%d" , &userInput);
    currencyConvert(userInput);
    printf("If you want to continue then enter 1 else enter 0\n");
    scanf("%d" , &select);
    if (select == 1)
    {
        goto again;
    } else {
        printf("Thanks ...\n");
    }
}
by

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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
}