/* program to enter a polynomial function as string and then enter a number for the function to fund the value of that function at the value entered*/ /* instructions: if u wanna add a function 4x^3+3x^2+2x+5+16 then enter as it is and also u need to provide a value of x .. so if u wanna enter at x= 2 just enter 2 in the next line..like this..... 4x^3+3x^2+2x+5+16 2 so that it will calculate the value of that function at x=2... * u can use any alphabet for variable but in (lower case) ..... *the program will autocorrect any extra space if added during function entering....so don't worry for that. ie u entered 2 x ^ 3 program understood 2x^3. * ^ = raised to power .... ie 2x^3 = 2 * x raised to power 3. thank u.... */ #include //#include #include using namespace std; void trim(char *ch) // program to find the vallue of the function entered as a string { int x=0; int j=0; for(int i=0;ch[i]!='\0';i++) { if(ch[i]==' ') { for( j=i;ch[j]==' ';j++) { } int diff = j-i-1; for(x=j;ch[x]!='\0';x++) { ch[x-(j-i-1)-1]=ch[x]; ch[x]=' '; } } } } int extract(char *ch,int st,int &last) { int var1=0; int var2=1; int digicnt=0; int result=0; int i=0; int *resarray = new int[30]; int it=0; for( i=st;(((ch[i]>=48)&&(ch[i]<=57))&&(ch[i]!='\0'));i++) { digicnt++; resarray[it]=((int)ch[i]-48); it++; } last = i-1; int x=0; int power=digicnt-1; int ans =0; for(int i=0;i>number; cout<<"\n u entered value :"<=48)&&(fun[i]<=57))&&(fun[i-1]!='^')&&(((fun[i+1]>=97)&&(fun[i+1]<=122))||((fun[i+1])>=48)&&(fun[i+1]<=57))) { d = extract(fun,i,l); i=l; coeff[ci]=d; ci++; } } int *powers = new int[no_terms]; for(int i=0;i=48)&&(fun[i]<=57))&&(fun[i-1]=='^')) { t=extract(fun,i,plast); powers[pi]=t; pi++; i=plast; } } int *constants = new int[no_terms]; for(int i=0;i=48)&&(fun[i]<=57)) { int j=0; for( j=i;((fun[j]>=48)&&(fun[j]<=57));j++) { } dcomp = j; } if((!((fun[dcomp]>=97)&&(fun[dcomp]<=122)))&&((fun[i]>=48)&&(fun[i]<=57))&&((fun[i-1]=='+')||(fun[i-1]=='-'))&&(((fun[i+1]>=48)&&(fun[i+1]<=57))||(fun[i+1]==' ')||((fun[i+1]=='+')||(fun[i+1]=='-')))) { constants[coni]=extract(fun,i,clast); coni++; i=clast; } } int *termres = new int[no_terms]; int ti=0; int final_ans =0; int pcalc=1; for(int i=0;i

function_evaluator.cpp