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How to write a program in C programming language to multiply two polynomials?

#include <stdio.h> #include <conio.h> #define MAX 10 struct term { int coeff ; int exp ; } ; struct poly { struct term t [10] ; int noofterms ; } ; void initpoly ( struct poly *) ; void polyappend ( struct poly *, int, int ) ; struct poly polyadd ( struct poly, struct poly ) ; void display ( struct poly ) ; void main( ) { struct poly p1, p2, p3 ; clrscr( ) ; initpoly ( &p1 ) ; initpoly ( &p2 ) ; initpoly ( &p3 ) ; polyappend ( &p1, 1, 4 ) ; polyappend ( &p1, 2, 3 ) ; polyappend ( &p1, 2, 2 ) ; polyappend ( &p1, 2, 1 ) ; polyappend ( &p2, 2, 3 ) ; polyappend ( &p2, 3, 2 ) ; polyappend ( &p2, 4, 1 ) ; p3 = polymul ( p1, p2 ) ; printf ( "\nFirst polynomial:\n" ) ; display ( p1 ) ; printf ( "\n\nSecond polynomial:\n" ) ; display ( p2 ) ; printf ( "\n\nResultant polynomial:\n" ) ; display ( p3 ) ; getch( ) ; } /* initializes elements of struct poly */ void initpoly ( struct poly *p ) { int i ; p -> noofterms = 0 ; for ( i = 0 ; i < MAX ; i++ ) { p -> t[i].coeff = 0 ; p -> t[i].exp = 0 ; } } /* adds the term of polynomial to the array t */ void polyappend ( struct poly *p, int c, int e ) { p -> t[p -> noofterms].coeff = c ; p -> t[p -> noofterms].exp = e ; ( p -> noofterms ) ++ ; } /* displays the polynomial equation */ void display ( struct poly p ) { int flag = 0, i ; for ( i = 0 ; i < p.noofterms ; i++ ) { if ( p.t[i].exp != 0 ) printf ( "%d x^%d + ", p.t[i].coeff, p.t[i].exp ) ; else { printf ( "%d", p.t[i].coeff ) ; flag = 1 ; } } if ( !flag ) printf ( "\b\b " ) ; } /* adds two polynomials p1 and p2 */ struct poly polyadd ( struct poly p1, struct poly p2 ) { int i, j, c ; struct poly p3 ; initpoly ( &p3 ) ; if ( p1.noofterms > p2.noofterms ) c = p1.noofterms ; else c = p2.noofterms ; for ( i = 0, j = 0 ; i <= c ; p3.noofterms++ ) { if ( p1.t[i].coeff p2.t[j].exp ) { p3.t[p3.noofterms].coeff = p1.t[i].coeff + p2.t[j].coeff ; p3.t[p3.noofterms].exp = p1.t[i].exp ; i++ ; j++ ; } else { p3.t[p3.noofterms].coeff = p1.t[i].coeff ; p3.t[p3.noofterms].exp = p1.t[i].exp ; i++ ; } } else { p3.t[p3.noofterms].coeff = p2.t[j].coeff ; p3.t[p3.noofterms].exp = p2.t[j].exp ; j++ ; } } return p3 ; }