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lab6/2.c

+#include <stdio.h>
+#include <math.h>
+#include <string.h>
+#include <stdlib.h>
+int findA(char* equation);
+int findB(char* equation);
+int findC(char* equation);
+int findDiscriminant(int B, int C);
+int main()
+
+{
+	
+	char string[100];
+	int a;
+	
+	int b;
+	
+	int c;
+	
+	scanf("%s", string);
+	
+	a= findA(string);
+	printf("A value %d\n", a);
+	
+	b= findB(string);
+	printf("B value %d\n", b);
+	
+	c= findC(string);
+	printf("C value %d", c);
+	
+	return 0;
+}
+ 
+ 
+ 
+ 
+ int findA(char* equation){
+	int i=0;
+	char A[100]={""};
+	while(1){
+		if (((equation[i]>47)&&(equation[i]<58))||(equation[i]=='x')){
+			if (equation[i]=='x'){
+				break;
+			}
+			else
+			{
+				strcat(A, &equation[i]);
+				i++;
+			}
+			A[i]='\0';	
+			
+			return atoi(A);
+		}else{
+			printf("you have a mistake in user input. ");
+			break;
+			}
+	}
+}
+
+
+int findB(char* equation){
+	int i=0;
+	char B[100]={""};
+	while(1){
+		if (equation[i]=='x'){
+		break;
+		}
+	i++;
+	}
+	while(1){
+		if (equation[i]=='+'){
+			break;
+		}else if(equation[i]=='-')
+		{
+			strncat(B, &equation[i], 1);
+			break;
+		}
+		i++;
+		}
+	i++;
+	while(1){
+		if (equation[i]=='x'){
+		break;
+		}
+		else
+		{
+			strncat(B, &equation[i], 1);
+			i++;
+		}
+	B[i]='\0';	
+	}
+	return atoi(B);
+	
+	}
+	
+	
+int findC(char* equation){
+	int i=0;
+	char C[100]={""};
+	int m=0;
+	while(1){
+		if (equation[i]=='x'){
+			m++;
+		}
+		if (m==2){
+			break;	
+		}
+		i++;
+	}
+	i=i+1;	
+	strcat(C, &equation[i]);
+
+
+	
+	C[i]='\0';	
+	return atoi(C);
+	}
+
+