because if i inputted a string or a character, my program captures the error but
the problem is that my program does not return from the initial spot or initial position
how can i solve that?this is my program
Code:
//This program can evaluate a 10th order polynomial single variable,
//can solve for statistical algorithms mainly mean, standard deviation
//and summation of data with a maximum of 10 data,
//can solve for ideal gas equation with the gas sample of nitrogen and
//can build a database of strings which can store of 16 strings with 128
//maximum characters, remove a string from the database, view the strings
//and search the strings inside the database
#include <stdio.h>
#include <conio.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
//Jerome H. Macatangay 10821333 MEE 2nd Year
//Andre Lloyd A. Torres 10832513 MEE 2nd Year
//Start Program
main(){
int selection;
//Variables for Polynomial Evaluation
double polysum=0, x;
int n, QA, m;
//Variables for Statistical Algorithms
int SA,a,b,sum=0,data[10];
float mean;
double calc,sd;
//Variables for Ideal Gas Equations
int unknown1;
float P, V, R, M, T;
R=8.3143/28.01;
//Variables for String Database
char string[16][128],temp[128],search[128];
int i=0,s=0,y,rep,sel,eq;
//Menu Selection Screen
do{
selection=0;
system("cls");
printf("Menu Selection Screen\n\n");
printf("1 - Polynomial Evaluation\n");
printf("2 - Statistical Algorithms\n");
printf("3 - Ideal Gas Law\n");
printf("4 - String Database\n");
printf("5 - Exit\n");
scanf("%d",&selection);
switch(selection){
case 1:
do{
do{
system("cls");
printf("Polynomial Evaluation\n\n");
printf("Enter the Order of Polynomial (max. 10): ");
scanf("%d",&n);
if(n>10||n<1){
system("cls");
printf("Invalid input. Please try again!!!\n");
printf("Please press the spacebar to continue!!");
getche();
}
}while(n>10||n<1);
double poly[n+1];
for(m=n;m>=0;m--){
printf("Please enter the constant for X raised to the %dth: ", m);
scanf("%lf",&poly[m]);
}
printf("Enter the value of X: ");
scanf("%lf",&x);
for(m=n;m>=0;m--)
polysum+=poly[m]*pow(x,m);
printf("The evaluated value of the %dth Order Polynomial %.2lf\n", n, polysum);
printf("Please press the spacebar to continue!!\n");
getche();
do{
system("cls");
printf("Do you want to repeat the computation?\n\n");
printf("1 - Yes\n");
printf("2 - No\n");
scanf("%d", &QA);
switch(QA){
case 1:
break;
case 2:
main();
break;
default:
system("cls");
printf("Invalid input. Please try again!!!\n");
printf("Please press the spacebar to continue!!");
getche();
break;
}
}while(QA>2||QA<1);
polysum=0;
}while(QA==1);
break;
case 2:
do{
sum=0;
mean=0;
calc=0;
sd=0;
system("cls");
printf("Statistical Algorithms\n\n");
printf("1 - Mean\n");
printf("2 - Standard Deviation\n");
printf("3 - Summation of data\n");
printf("4 - Go Back to Menu Selection Screen\n");
scanf("%d", &SA);
switch(SA){
case 1:
do{
system("cls");
printf("Mean\n\n");
printf("Enter the Number of Data (max. 10): ");
scanf("%d", &b);
if(b>10||b<1){
system("cls");
printf("Invalid input. Please try again!!!\n");
printf("Please press the spacebar to continue!!");
getche();
}
}while(b>10||b<1);
for(a=0;a<b;a++){
printf("Enter the Actual Values of Data %d: ", a+1);
scanf("%d",&data[a]);
}
for(a=0;a<b;a++){
sum=sum+data[a];
}
mean=(float)sum/a;
printf("The Mean of the Data is %f\n",mean);
printf("Please press the spacebar to continue!!");
getche();
break;
case 2:
do{
system("cls");
printf("Standard Deviation\n\n");
printf("Enter the Number of Data (max. 10): ");
scanf("%d", &b);
if(b>10||b==0){
system("cls");
printf("Invalid input. Please try again!!!\n");
printf("Please press the spacebar to continue!!\n");
getche();
}
}while(b>10||b==0);
for(a=0;a<b;a++){
printf("Enter the Actual Values of Data %d: ", a+1);
scanf("%d",&data[a]);
}
if(b==1){
printf("The Standard Deviation the Data is 0\n");
printf("Please press the spacebar to continue!!");
getche();
break;
}
for(a=0;a<b;a++){
sum=sum+data[a];
}
mean=(float)sum/a;
for(a=0;a<b;a++){
calc+=pow((data[a]-mean),2);
}
sd=sqrt(calc/(b-1));
printf("The Standard Deviation the Data is %lf\n",sd);
printf("Please press the spacebar to continue!!");
getche();
break;
case 3:
do{
system("cls");
printf("Summation of Data\n\n");
printf("Enter the Number of Data (max. 10): ");
scanf("%d", &b);
if(b>10||b<1){
system("cls");
printf("Invalid input. Please try again!!!\n");
printf("Please press the spacebar to continue!!");
getche();
}
}while(b>10||b<1);
for(a=0;a<b;a++){
printf("Enter the Actual Values of Data %d: ", a+1);
scanf("%d",&data[a]);
}
for(a=0;a<b;a++){
sum=sum+data[a];
}
mean=(float)sum/a;
printf("The Summation of the Data is %d\n",sum);
printf("Please press the spacebar to continue!!");
getche();
break;
case 4:
main();
break;
default:
system("cls");
printf("Invalid Input. Please try again!!!\n");
printf("Please press the spacebar to continue!!");
getche();
break;
}
}while(SA!=4);
break;
case 3:
do{
P=0;
V=0;
M=0;
T=0;
system("cls");
printf("Ideal Gas Law\n");
printf("PV = mRT\n\n");
printf("Select one of the Unknowns\n");
printf("1 - P\n");
printf("2 - V\n");
printf("3 - M\n");
printf("4 - T\n");
printf("5 - Go Back to Menu Selection Screen\n");
scanf("%d", &unknown1);
switch(unknown1){
case 1:
do{
system("cls");
printf("Solving for Pressure\n\n");
printf("Volume (m^3): ");
scanf("%f",&V);
printf("Mass (kg): ");
scanf("%f",&M);
printf("Temperature (K): ");
scanf("%f",&T);
if(V<=0){
system("cls");
printf("Invalid input of Volume\n");
printf("Please press the spacebar to continue!!");
getche();
}
if(M<=0){
system("cls");
printf("Invalid input of Mass\n");
printf("Please press the spacebar to continue!!");
getche();
}
if(T<=-273){
system("cls");
printf("Invalid input of Temperature\n");
printf("Please press the spacebar to continue!!");
getche();
}
}while(V<=0||T<=-273||M<=0);
P = M*R*T/V;
printf("The Pressure is %f kPa\n",P);
printf("Please press the spacebar to continue!!");
getche();
break;
case 2:
do{
system("cls");
printf("Solving for Volume\n\n");
printf("Pressure (KPa): ");
scanf("%f",&P);
printf("Mass (kg): ");
scanf("%f",&M);
printf("Temperature (K): ");
scanf("%f",&T);
if(P<=0){
system("cls");
printf("Invalid input of Pressure\n");
printf("Please press the spacebar to continue!!");
getche();
}
if(M<=0){
system("cls");
printf("Invalid input of Mass\n");
printf("Please press the spacebar to continue!!");
getche();
}
if(T<=-273){
system("cls");
printf("Invalid input of Temperature\n");
printf("Please press the spacebar to continue!!");
getche();
}
}while(P<=0||T<=-273||M<=0);
V = M*R*T/P;
printf("The Volume is %f m^3\n",V);
printf("Please press the spacebar to continue!!");
getche();
break;
case 3:
do{
system("cls");
printf("Solving for Mass\n\n");
printf("Pressure (KPa): ");
scanf("%f",&P);
printf("Volume (m^3): ");
scanf("%f",&V);
printf("Temperature (K): ");
scanf("%f",&T);
if(P<=0){
system("cls");
printf("Invalid input of Pressure\n");
printf("Please press the spacebar to continue!!");
getche();
}
if(V<=0){
system("cls");
printf("Invalid input of Volume\n");
printf("Please press the spacebar to continue!!");
getche();
}
if(T<=-273){
system("cls");
printf("Invalid input of Temperature\n");
printf("Please press the spacebar to continue!!");
getche();
}
}while(P<=0||T<=-273||V<=0);
M=(P*V)/(R*T);
printf("The Mass is %f kg\n",M);
printf("Please press the spacebar to continue!!");
getche();
break;
case 4:
do{
system("cls");
printf("Solving for Temperature\n\n");
printf("Pressure (KPa): ");
scanf("%f",&P);
printf("Volume (m^3): ");
scanf("%f",&V);
printf("Mass (kg): ");
scanf("%f",&M);
if(P<=0){
system("cls");
printf("Invalid input of Pressure\n");
printf("Please press the spacebar to continue!!");
getche();
}
if(V<=0){
system("cls");
printf("Invalid input of Volume\n");
printf("Please press the spacebar to continue!!");
getche();
}
if(M<=0){
system("cls");
printf("Invalid input of Mass\n");
printf("Please press the spacebar to continue!!");
getche();
}
}while(P<=0||M<=0||V<=0);
T = (P*V)/(M*R);
printf("The Temperature is %f K\n",T);
printf("Please press the spacebar to continue!!");
getche();
break;
case 5:
main();
break;
default:
system("cls");
printf("Invalid input, please try again!!\n");
printf("Please press the spacebar to continue!!");
getche();
break;
}
}while(unknown1 != 5);
break;
case 4:
do{
do{//Menu Selection Screen
do{
system("cls");
printf("String Database\n\n");
printf("1 - Store a String to the Database\n");
printf("2 - Remove a String from the Database\n");
printf("3 - View Strings in the Database\n");
printf("4 - Search a String in the Database\n");
printf("5 - Go Back to Menu Selection Screen\n");
scanf("%d",&selection);
if(selection<1||selection>5){
system("cls");
printf("Invalid input. Please try again!!!\n");
printf("Please press the spacebar to continue!!");
getche();
break;
}
}while(selection<1||selection>5);
}while(selection!=1&&selection!=2&&selection!=3&&selection!=4&&selection!=5);
if(selection==1){
do{//Store a String to the Database
system("cls");
printf("How many string do you want enter: ");
scanf("%d",&s);
for(i=-1;i<s;i++){
printf("Input a string: ");
gets(string[i]);
}
do{
do{
system("cls");
printf("String successfully added\n");
printf("Enter another string?\n\n");
printf("1 - Yes\n");
printf("2 - No\n");
scanf("%d",&rep);
if(rep<1||rep>2){
system("cls");
printf("Invalid input. Please try again!!!\n");
printf("Please press the spacebar to continue!!");
getche();
break;
}
}while(rep<1||rep>2);
}while(rep!=1&&rep!=2);
}while(rep==1);
}
else if(selection==2){
do{//Remove a String from the Database
system("cls");
printf("Select position of string to remove:\n");
for(i=0;i<s;i++)
printf("%d-%s\n",i+1,string[i]);
scanf("%d",&y);
strcpy(string[y-1],"");
s--;
strcpy(temp,string[s]);
for(i=y;i<s;i++)
strcpy(string[i-1],string[i]);
strcpy(string[s-1],temp);
do{
do{
system("cls");
printf("String successfully deleted\n");
printf("Remove another string?\n\n");
printf("1 - Yes\n");
printf("2 - No\n");
scanf("%d",&rep);
if(rep<1||rep>2){
system("cls");
printf("Invalid input. Please try again!!!\n");
printf("Please press the spacebar to continue!!");
getche();
break;
}
}while(rep<1||rep>2);
}while(rep!=1&&rep!=2);
}while(rep==1);
}
else if(selection==3){//View Strings in the Database
system("cls");
for(i=0;i<s;i++)
printf("%d - %s\n",i+1,string[i]);
printf("Please press the spacebar to continue!!\n");
getch();
}
else if(selection==4){
do{//Search a String in the Database
system("cls");
eq=1;
strcpy(search,"");
for(i=-1;i<1;i++){
printf("Enter string to search: ");
gets(search);
}
for(i=0;i<s;i++){
eq=strcmp(string[i],search);
if(eq==0)
break;
}
do{
system("cls");
if(eq==0){
printf("String matched\n");
printf("Position of searched string in array is %d\n",i+1);
printf("Please press the spacebar to continue!!\n");
getche();
}
else{
do{
printf("String not found\n");
printf("Search another string?\n\n");
printf("1 - Yes\n");
printf("2 - No\n");
scanf("%d",&rep);
if(rep<1||rep>2){
system("cls");
printf("Invalid input. Please try again!!!\n");
printf("Please press the spacebar to continue!!");
getche();
break;
}
}while(rep<1||rep>2);
}
}while(rep!=1&&rep!=2);
}while(rep==1);
}
else if(sel==5){
main();
break;
}
}while(sel!=5);
break;
case 5:
return 0;
break;
default:
system("cls");
printf("Invalid input. Please try again!!!\n");
printf("Please press the spacebar to continue!!");
getche();
break;
}
}while(selection>5 || selection<=0);
}
