submition8

a1/program.c

@@ -62,17 +62,19 @@ int reading_strings_and_storing_them_in_memory(link* pointer_to_start_of_chain){
     return counter;
 }
 int analizing_string(char* pointer){
-    char token1[SIZE];
-    char token2[SIZE];
-    char token3[SIZE];
+    char first_number[SIZE];
+    char second_number[SIZE];
+    char result_nubmer[SIZE];
+
+    memset(first_number, 0, SIZE);
+    memset(second_number, 0, SIZE);
+    memset(result_nubmer, 0, SIZE);
 
     float number1, number2, result3;
-    char buffer_for_token[SIZE];
-    strcpy(buffer_for_token,pointer);
-    int counter=0;
     char operant;
-    int i=0;
 
+    int i = 0;
+    int counter=0;
     while(pointer[i]!='\0'){
         if(pointer[i]=='+'||pointer[i]=='/'||pointer[i]=='*'||pointer[i]=='-'){
             operant=pointer[i];
@@ -84,36 +86,51 @@ int analizing_string(char* pointer){
         i++;
     }
 
-    char delim[] =" +=-*/\n";
+    i = 0;
+    // Look for the start of the first number.
+    i = skip_spaces(i, pointer);
 
-    char *first_number_cucumber=strtok(buffer_for_token, delim);
-    if(first_number_cucumber==NULL) {//||is_number_question_mark(first_number_cucumber)==0){
-        return -1;
-    }
-    strcpy(token1, first_number_cucumber);
+    // Copy first number to its destination.
+    i = copy_number(first_number, pointer, i);
 
-    char *second_number=strtok(NULL, delim);
-    if(second_number==NULL) { //||is_number_question_mark(second_number)==0){
-        return -1;
-    }
-    strcpy(token2, second_number);
-
-
-    char *result_token=strtok(NULL, delim);
-    if(result_token==NULL) { //||is_number_question_mark(result)==0){
-        return -1;
-    }
-    strcpy(token3, result_token);
-
-    char *token = strtok(NULL, delim);
-    if(token!=NULL){
+    // Look for the start of the operation;
+    i = skip_spaces(i, pointer);
+    // Processing operation.
+    operant = pointer[i];
+    i++;
+    if (operant != '+' && operant != '-' && operant != '*' && operant != '/') {
         return -1;
     }
 
+    // Look for the start of the second number;
+    i = skip_spaces(i, pointer);
 
-    number1=atof(token1);
-    number2=atof(token2);
-    result3=atof(token3);
+    // Copy second number to its destination.
+    i = copy_number(second_number, pointer, i);
+
+    // Look for the start of the "=";
+    i = skip_spaces(i, pointer);
+    // Processing "="
+    if (pointer[i] != '=') {
+        return -1;
+    }
+    i++;
+
+    // Look for the start of the result number;
+    i = skip_spaces(i, pointer);
+
+    // Copy result number to its destination.
+    i = copy_number(result_nubmer, pointer, i);
+
+    // Look for the start of the "\n";
+    i = skip_spaces(i, pointer);
+    if ('\n' != pointer[i]) {
+        return -1;
+    }
+
+    number1=atof(first_number);
+    number2=atof(second_number);
+    result3=atof(result_nubmer);
 
     if(operant=='+' &&result3==number1+number2){
         return 1;
@@ -130,6 +147,27 @@ int analizing_string(char* pointer){
     return 0;
 }
 
+int skip_spaces(int i, char *pointer) {
+    while(pointer[i]==' '){
+        i++;
+    }
+
+    return i;
+}
+
+int copy_number(char number[], char *pointer, int i) {
+    int destination_i = 0;
+    while(pointer[i]!='\0'){
+        if (!isdigit(pointer[i])&&pointer[i]!='.'&&pointer[i]!=',') {
+            break;
+        }
+        number[destination_i] = pointer[i];
+        destination_i++;
+        i++;
+    }
+
+    return i;
+}
 
 /*int is_number_question_mark(char *pointer){
     for(int i=0; pointer[i]!='\0'; i++){