リンクリストに文字を入力しようとしています。文字は「A」、「a」、「G」、「g」、「T」、「t」、「C」、「c」のいずれかになります。
私はまだCに精通しておらず、ここで何かを台無しにしたことを知っています。
do{
printf ("\nEnter a new nucleotide: \n");
scanf("%c",&newChar);
/* Checking */
if(newChar == 'A' ||
newChar == 'a' ||
newChar == 'G' ||
newChar == 'g' ||
newChar == 'T' ||
newChar == 't' ||
newChar == 'C' ||
newChar == 'c' )
{
AddToSequence(newChar);
size++;
} else {
printf ("\nBad Element");
}
}while(newChar != 'x');
newCharは、ジャンク値（この場合は「q」）で初期化されます。
'x'を入力するとループが終了し、許容値を入力するとAddToSequence（）が呼び出され、許容値を入力しないと警告が表示されます。
何らかの理由で、newCharの値に関係なく、elseにジャンプします。また、ユーザーからの入力を待たずにscanfをまっすぐ通過し、ループするたびに2つのループを実行します。誰かが私がどこで間違っているのか教えてもらえますか？
完全なプログラム：
#include<stdio.h>
#include<stdlib.h>
/*Structure declaration for the node*/
struct node{
char nucleotide;
struct node *point;
}*start;
/* Adds a nucleotide to the chain. Creates a new linked list if no chain exists exists.*/
void AddToSequence(char nucleotide){
struct node *loc, *first;
//Dynamic memory is been allocated for a node
first=(struct node*)malloc(sizeof(struct node));
first->nucleotide=nucleotide;
first->point=NULL;
if(start==NULL){
/*If list is empty*/
start=first;
}else{
/*Element inserted at the end*/
loc=start;
while(loc->point!=NULL){
loc=loc->point;
loc->point=first;
}
}
}
/* Display elements */
void Display(){
struct node *loc;
if(start == NULL){
printf ("\n\nList is empty");
return;
}
loc=start;
printf("\n\nList is : ");
while(loc!=NULL){
printf ("%c", loc->nucleotide);
loc=loc->point;
}
printf ("\n");
}
/* Finds and displays percentage of the chain made up of each nucleotide. */
void Percentage(int size){
struct node *loc;
if(start == NULL){
printf ("\n\nList is empty");
return;
}
loc=start;
printf("\n\nList is : ");
int A = 0, G =0, T =0, C = 0;
double Adouble = 0, Gdouble =0, Tdouble=0, Cdouble=0;
while(loc!=NULL){
if(loc->nucleotide=='A' || 'a'){A++;}
if(loc->nucleotide=='G' || 'g'){G++;}
if(loc->nucleotide=='T' || 't'){T++;}
if(loc->nucleotide=='C' || 'c'){C++;}
loc=loc->point;
}
printf ("\n");
/* Convert to double for percentages as int loses precision */
Adouble =A;
Gdouble =G;
Tdouble =T;
Cdouble =C;
Adouble =(Adouble/size)*100;
Gdouble =(Gdouble/size)*100;
Tdouble =(Tdouble/size)*100;
Cdouble =(Cdouble/size)*100;
printf("\nA: %f", Adouble);
printf("\nG: %f", Gdouble);
printf("\nT: %f", Tdouble);
printf("\nC: %f", Cdouble);
}
/* There be dragons beyond here */
int main(){
int navigate, size =0;
char newChar = 'q';
do{ /* Menu */
printf("\n 1. Create / Extend Sequence\n");
printf("\n 2. Display Sequence\n");
printf("\n 3. Count \n");
printf("\n 0. Exit \n");
printf("\nPlease select an option (0 to 3)\n");
scanf("%d",&navigate);
switch (navigate){
case 0: /* Exit */
break;
case 1: /* Add nucleotides */
do{
printf ("\nEnter a new nucleotide: \n");
scanf("%c",&newChar);
/* Some error checking */
if(newChar == 'A' || newChar == 'a' || newChar == 'G' || newChar == 'g' || newChar == 'T' || newChar == 't' || newChar == 'C' || newChar == 'c' ){
AddToSequence(newChar);
size++;
} else {
printf ("\nBad Element");
}
}while(newChar != 'x');
break;
case 2:
Display();
break;
case 3:
Percentage(size);
break;
default:
printf ("\n\nBad choice. Please select another.\n");
}
} while (navigate !=0);
return 0 ;
}