#include<stdio.h>
#include<math.h>  
struct poly
{
    int exp,coeff;
};          

struct poly a[10],b[10],c[10];
int main()
{
printf("Name- Aswin.S \nRoll.No-18\n\n\n");
   int i;
  int deg1,deg2;        
  int k=0,l=0,m=0;
  printf("Enter degree of first polynomial:");
  scanf("%d",&deg1);       
  for(i=0;i<=deg1;i++)
  {   
       
    printf("\nEnter the coeff of x^%d :",i);
    scanf("%d",&a[i].coeff);
       
       a[k++].exp = i;
   }
  
   printf("\nEnter degree of second polynomial:");
   scanf("%d",&deg2);
   for(i=0;i<=deg2;i++)
   {
     printf("\nEnter the coeff of x^%d :",i);
     scanf("%d",&b[i].coeff);
     b[l++].exp = i;
   }
   
   printf("\nExpression 1 = ",a[0].coeff);
   for(i=0;i<=deg1;i++)
   {
       printf(" %dx^%d",a[i].coeff,a[i].exp);
   }        
   
   printf("\nExpression 2 = ",b[0].coeff);
   for(i=0;i<=deg2;i++)
   {    
       printf(" %dx^%d",b[i].coeff,b[i].exp);
   }
   
   if(deg1>deg2)
   {
       for(i=0;i<=deg2;i++)
       {
        c[m].coeff = a[i].coeff + b[i].coeff;                
        c[m].exp = a[i].exp;
           m++;
       }   
       for(i=deg2+1;i<=deg1;i++)
       {    
           c[m].coeff = a[i].coeff;
           c[m].exp = a[i].exp;
           m++;
       }  
   }                              
   else                   
   {                                  
       for(i=0;i<=deg1;i++)
       {                            
        c[m].coeff = a[i].coeff + b[i].coeff;
        c[m].exp = a[i].exp;
           m++;
       }          
       for(i=deg1+1;i<=deg2;i++)
       {    
           c[m].coeff = b[i].coeff;
           c[m].exp = b[i].exp;
            m++;
       }
   }
  
   printf("\nExpression after addition  = ",c[0].coeff);
   for(i=0;i<m;i++)
   {
       printf(" %dx^%d",c[i].coeff,c[i].exp);
   }
return 0;
}
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int main()
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    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
}