Read a string and get it in (int) in C - c

Question

Can you help me? I have a string 23;56;36.6;run in a txt file.Then I am reading this string in order to use it for some work: I would like to take this values from a string, then compare them with some values in a code and output my result in console. I think,I should use atoi() function that make my string in numbers, for picking out , I am using strtok(). But how correctly should I record my tokens in loop while and the last token is a type of char. How can I do this work?
CODE:
void printInfo(int note)
{
int i;
FILE *out;
char str[250];
char sp[10]=";";
char *istr;
if ((out =fopen("test.txt","r"))==NULL)
printf("Error open, file\n");
else
{
for (i=0;i<note;i++)
{
fgets(str,250,out);
istr=strtok(str,sp);
while (istr != NULL)
{
printf("%d\n",atoi(istr));
istr=strtok(NULL,sp);
// I think, I need to create a variable for recording my values.
}
}
}
fclose(out);
}

Answer 1

I would use sscanf to convert the string to the three floats:
#include <stdio.h> // sscanf
#include <stdlib.h> // EXIT_SUCCESS
#include <string.h> // memset
int main(void) {
const char *input = "23;56;36.6;run";
int i;
float numbers[3] = {0, 0, 0};
char buf[10];
int nElementsRead;
// init buf
memset(buf, 0, sizeof(buf));
// sscanf returns the number of read elements
// or EOF on error
nElementsRead = sscanf(input, "%f;%f;%f;%9s", &numbers[0], &numbers[1], &numbers[2], buf);
if (nElementsRead == 4) {
printf("Successfully read %d elements\n", nElementsRead);
for (i = 0; i < 3; ++i) {
printf("number[%d]: %f\n", i, numbers[i]);
}
printf("Buffer is: %s\n", buf);
} else {
printf("Something went wrong!");
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}

Answer 2

Another solution, using comparable records:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
typedef struct MyRecord_s {
int f1;
int f2;
float f3;
char f4[10];
} MyRecord;
static int MyRecordInit( MyRecord * out, char * line ) {
if( out == NULL ) {
return 0;
}
char * f1 = strtok( line, ";" );
char * f2 = strtok( NULL, ";" );
char * f3 = strtok( NULL, ";" );
char * f4 = strtok( NULL, ";" );
if( f1 && f2 && f3 && f4 ) {
char * err = NULL;
out->f1 = strtol( f1, &err, 10 );
if( err && *err ) {
return 0;
}
out->f2 = strtol( f1, &err, 10 );
if( err && *err ) {
return 0;
}
out->f3 = strtof( f1, &err );
if( err && *err ) {
return 0;
}
strncpy( out->f4, f4, 10 );
out->f4[9] = '\0';
return 1;
}
return 0;
}
int MyRecordCmp( const MyRecord * r1, const MyRecord * r2 ) {
int diff = r1->f1 - r1->f2;
if( diff ) {
return diff;
}
diff = r1->f2 - r2->f2;
if( diff ) {
return diff;
}
float d = r1->f3 - r2->f3;
if( d > 0.000001 ) {
return +1;
}
if( d < -0.000001 ) {
return -1;
}
return strcmp( r1->f4, r2->f4 );
}
int main() {
char line1[] = "23;56;36.6;run";
char line2[] = "24;57;37.6;stop";
MyRecord r1, r2;
if( MyRecordInit( &r1, line1 ) && MyRecordInit( &r2, line2 )) {
printf( "cmp: %d\n", MyRecordCmp( &r1, &r2 ));
}
return 0;
}