How to find an element in an array in C
- by gkaykck
I am trying to find the location of an element in the array.
I have tried to use this code i generated
for(i=0;i<10;i++)
{
if (strcmp(temp[0],varptr[i])==0) j=i;
}
varptr is a pointer which points to array var[11][10] and it is by the definition *varptr[11][10]. I have assigned strings to var[i] and i want to get the "i" number of my element NOT THE ADRESS.
Thanks for any comment.
EDit: temp is also a pointer which points to the string that i want to check. Also i am using the 2D array for keeping variable names and their address. So yes i want to keep it inside a 2D array. The question is this code is not working at all, it does not assigns i to j, so i wonder where is the problem with this idea? writing a "break" does not change if the code works or not, it just optimizes the code a little.
Full Code:
#include <stdio.h>
#include <string.h>
#include <ctype.h>
double atof(char*);
int main(void)
{
char in[100], *temp[10],var[11][10],*varptr[11][10];
int i,j, n = 0,fullval=0;
double val[11];
strcpy(var[11], "ans");
for(i=0;i<11;i++)
{
for(j=0;j<10;j++) varptr[i][j]=&var[i][j];
}
START:
printf("Enter the expression: ");
fflush(stdout);
for(i=0;i<10;i++) temp[i]=NULL;
if (fgets(in, sizeof in, stdin) != NULL)
{
temp[0] = strtok(in, " ");
if (temp[0] != NULL)
{
for (n = 1; n < 10 && (temp[n] = strtok(NULL," ")) != NULL; n++)
;
}
if (*temp[0]=="quit")
{
goto FINISH;}
if (isdigit(*temp[0]))
{
if (*temp[1]=='+') val[0] = atof(temp[0])+atof(temp[2]);
else if (*temp[1]=='-') val[0] = atof(temp[0])-atof(temp[2]);
else if (*temp[1]=='*') val[0] = atof(temp[0])*atof(temp[2]);
else if (*temp[1]=='/') val[0] = atof(temp[0])/atof(temp[2]);
printf("%s = %f\n",var[11],val[0]);
goto START;
}
else
if (temp[1]==NULL) //asking the value of a variable
{
for(i=0;i<10;i++)
{
if (strcmp(temp[0],varptr[i])==0) j=i;
}
printf("%s = %d\n",var[j],val[j]);
goto START;
}
if (*temp[1]==61)
{
strcpy(var[fullval], temp[0]);
if ((temp[3])!=NULL)
{
}
val[fullval]=atof(temp[2]);
printf("%s = %f\n",var[fullval],val[fullval]);
fullval++;
goto START;
}
if (*temp[1]!=61)
{
}
}
getch();
FINISH:
return 0;
}
