Why is can't num scan the intended value in c? - c

Question

I have to scan this file which partly contains
SNOL
INTO num IS 8
INTO res IS 9
and the output of the code below is
Program starts...
Set value of num to 0
Set value of res to 8
input msg
which is wrong because num should be 8 and res should be 9
why is it num scanning 0 instead of 8?
and why doesn't the code work anymore if I assign number to num and number to res?
num = number;
//Tokenizer functions//
bool isLowerCase(const char *object)
{
int i;
int len = strlen(object);
for(i = 0; i < len; i++) {
if(object[i] >= 'a' && object[i] <= 'z') {
return true;
}
}
return false;
}
//function to check if character is Float.
bool objectFloat(const char* object) {
//check if 1st character is a digit, if not then return false,
otherwise
return true.
if(!isdigit(object[0]))
return false;
// Check if the 2nd character to the last are digits or periods.
// If not, return false otherwisereturn true
int periods = 0; //initialize how many periods in the object to zero
int i;
//if character is a period then increment periods.
for(i = 1; i < strlen(object); i++) {
if(object[i] == '.') {
periods++;
}
//return false if character is not a digit
else if(!isdigit(object[i])) {
return false;
}
}
// return true if there is only one period.
return periods == 1;
}
//function to check if character is a keyobject.
bool isKeyobject(const char* object) {
char keyobjects[11][11] = { "SNOL", "LONS", "INTO", "IS", "MULT", "BEG",
"PRINT", "ADD", "SUB", "DIV", "MOD" };
int i;
for(i = 0; i < 11; i++) {
// Check if object is equal to keyobjects at index i
// If yes, return true
if(isLowerCase(object))
return false;
if(strcmp(object, keyobjects[i]) == 0) {
return true;
}
}
//object is not equal to any of the keyobjects so return false
return false;
}
//Function to check if every character is an integer
// If not, return false otherwise return true
bool objectInt(const char* object) {
int i;
for(i = 0; i < strlen(object); i++) {
if(!isdigit(object[i])) return false;
}
return true;
}
bool objectIsVariable(const char* object) {
// Check if alphanumeric character & lower case
// If not, return false
int i;
for(i = 0; i < strlen(object); i++) {
if(!isalnum(object[i]) && !isLowerCase(object)) return false;
}
return true;
}
int main() {
FILE *s_path = fopen("test.snol", "r");
int number = 0;
int num, res;
if(isKeyobject(object) && strcmp(object, IsitSNOL) == 0) {
printf("Program starts...\n");
}
else if(isKeyobject(object) && strcmp(object, IsitINTO) == 0) {
printf("Set value of ");
}
if(objectInt(object)) {
number = atoi(object);
}
else if(objectFloat(object)) {
number = atof(object);
}
if(objectIsVariable(object) && strcmp(object, IsitNum) == 0) {
//if float
printf("num to %d\n", number);
num == number;
}
else if(objectIsVariable(object) && strcmp(object, IsitRes) == 0) {
//if float
printf("res to %d\n", number);
res == number;
}
else if(isKeyobject(object) && strcmp(object, IsitBEG) == 0) {
printf("input msg\n");
scanf("%s", msg);
fscanf(s_path, " %s", &object);
printf("INPUT(%s): %s\n", object, msg);
}
}
} // END MAIN -----------------------------------//

Answer 1

The problem seem to be that you read the number after the variable name but you do the print before.
So your sequence is:
Keyobject INTO
objectIsVariable num // Now you print the value
objectInt // Now you read the value
You need to postpone the printing until you have actually read the value.
This is not a very elegant solution, but you can try like:
int flag = 0;
if(objectInt(object)) {
number = atoi(object);
if (flag == 1)
{
num = number;
printf("num to %d\n", number);
}
else if (flag == 2)
{
res = number;
printf("res to %d\n", number);
}
else
{
printf("Illegal flag\n");
}
flag = 0;
}
if(objectIsVariable(object) && strcmp(object, IsitNum) == 0) {
flag = 1;
}
else if(objectIsVariable(object) && strcmp(object, IsitRes) == 0) {
flag = 2;
}