Update 2.c

lab6/2.c

@@ -5,61 +5,190 @@
 int findA(char* equation);
 int findB(char* equation);
 int findC(char* equation);
-int findDiscriminant(int B, int C);
+int result(int D,int  B, int A);
+int findDiscriminant(int B, int C, int A);
+int userInput(char* string);
+int IsNumber(char* string, int i);
 int main()
 
 {
 	
 	char string[100];
-	int a;
-	
-	int b;
-	
-	int c;
+	int a,b,c,d;
+	int Bool = 1;
 	
+	printf("Write your equation:\n");
+	while(Bool){
 		scanf("%s", string);
-	
-	a= findA(string);
+		Bool = userInput(string);
+		if (Bool==1){
+				printf("please repeat make sure that your code meets the next form Ax^2+Bx+c, where a,b and c are integers\n");
+		}	
+	}
+	a = findA(string);
 	printf("A value %d\n", a);
 	
-	b= findB(string);
+	b = findB(string);
 	printf("B value %d\n", b);
 	
-	c= findC(string);
-	printf("C value %d", c);
+	c = findC(string);
+	printf("C value %d\n", c);
 	
+	d =  findDiscriminant(b,c,a);
+	printf("the discriminant %d\n", d);
+	
+	Bool = result(d, b, a);
 	return 0;
 }
  
+int result(int D,int  B, int A){
+	double outpt;
+	if ( D < 0 ) {
+		printf("There is no solution, the D<0");
+	}else if (D == 0){
+		printf("there is only one solution\n");
+		outpt = -B/(2*A);
+		printf(" x = %fl", outpt);
+	}else{
+		printf("There are two solutions\n");
+		printf("The first:\n");
+		outpt = (-B-sqrt(D))/(2*A);
+		printf(" x = %f\n", outpt);
+		printf("The second:\n");
+		outpt = (-B+sqrt(D))/(2*A);
+		printf(" x = %f", outpt);
 		
+		}
+	return(1);
+	}
 
+int findDiscriminant(int B, int C, int A){
+	int D;
+	D = B*B-4*A*C;
+	return(D);
+	}
 
- int findA(char* equation){
+ 
+int findA(char* equation){
 	int i=0;
 	char A[100]={""};
+	char one[100]={"1"};
 	while(1){
-		if (((equation[i]>47)&&(equation[i]<58))||(equation[i]=='x')){
 		if (equation[i]=='x'){
 		break;
 		}
 		else
 		{
-				strcat(A, &equation[i]);
+			strncat(A, &equation[i], 1);
 			i++;
 		}
-			A[i]='\0';	
-			
+	}
+	if(((equation[0]=='-')&&(equation[1]=='x'))||(equation[0]=='x'))
+	{
+		strcat(A,&one[0]);
+		}
 	return atoi(A);
+	
+	}
+
+int IsNumber(char* string, int i){
+	int m;
+	m = 1;
+	if ((string[i]<58)&&(string[i]>47)){
+		m = 0;
+		}
+	return (m);
+	}	
+	
+	
+	
+	
+	
+int userInput(char* string){
+		int i, bool;	
+		bool = 0;
+		i = 0;
+			if ( (string[i] == '-') || ((string[i] < 58) && (string[i]) > 48) || (string[i] == 'x')) {
+				//printf("the First value is okay\n");
 			}else{
-			printf("you have a mistake in user input. ");
+			//	printf("the first element is wrong\n");
+				bool=1;
+			}
+			
+			
+			if (string[i] == '-'){
+				i++;
+				//printf("the first sign is -\n");
+			}
+			
+			
+			while(i < strlen(string)-5){
+				if(string[i]=='x'){
 					break;
 				}
+				else if(IsNumber(string, i))
+				{
+					bool=1;
+					break;
 				}
-}
+				i++;
+				
+			}
+			
+			if ((string[i+1] == '^')&&(string[i+2] == '2')&&((string[i+3] == '-')||(string[i+3] == '+')))
+			{
+				//printf("the first argument is okay\n");
+			}else{
+				//printf("the firstargument is wrong\n");
+				bool=1;
+			}
+			i = i+4;
+			
+			
+			while(i < string[i] - 2){
+				if(string[i]=='x'){
+					break;
+				}
+				else if(IsNumber(string, i))
+				{
+				//	printf("the second argument is not good\n");
+					bool=1;
+					break;
+				}
+				i++;
+					
+			}
+			
+			
+			if ((string[i+1] == '-')||(string[i+1] == '+')){
+				i++;
+				//printf("the sign is correct after x^2\n");
+			}else{
+				//printf("the sign is wrong\n");
+				bool=1;
+			}
+			i++;
+			//printf("%c\n", string[i]);
+			
+			while(i<strlen(string)){
+				if (IsNumber(string, i)){
+				//	printf("the third value is not good\n");
+					bool=1;
+					break;
+				}else{
+					//printf("%c", string[i]);
+					i++;
+				}
+			}	
+		return(bool);
+		}
+
+
 
 
 int findB(char* equation){
 	int i=0;
+	char one[100]={"1"};
 	char B[100]={""};
 	while(1){
 		if (equation[i]=='x'){
@@ -78,6 +207,9 @@ int findB(char* equation){
 		i++;
 		}
 	i++;
+	if (equation[i]=='x'){
+		strncat(B, &one[0], 1);
+	}
 	while(1){
 		if (equation[i]=='x'){
 		break;
@@ -109,11 +241,6 @@ int findC(char* equation){
 	}
 	i=i+1;	
 	strcat(C, &equation[i]);
-
-
-	
-	C[i]='\0';	
 	return atoi(C);
 	}
 
-