C language Atof,atoi, strtok and other functions usage

Atoi is to convert a string to int type data

Atof is converted to float type

Strtok are delimited strings.

The first example uses SSCANF, which is not used Strtok

#include <stdio.h> #include <stdlib.h> #include <ctype.h> #include <string.h> #define  max _line 2048int main () {    file *fr;    fr =  fopen ("Test_group_box.txt",  "R");     if (NULL&NBSP;==&NBSP;FR) {         printf ("error!\n");         return - 1;    }    float t;    char test_n_arr[ max_line];    //  char *test_n_arr =  (char*) malloc (sizeof (char)  *max_line);    char str1[50], str2[50], str3[50];     //  char str1, str2, str3;    //   "Read each  line of fr and assign each fields to three pointers "     while  (!feof (Fr))  {        fgets (test_n_arr, max_line,  FR); &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;SSCANF (test_n_arr,  "%s\t%s\t%s", &NBSP;STR1,&NBSP;STR2 , &NBSP;STR3);         t = atof (STR3);         printf ("%s\t",  str1);         printf ("%s\t ", &NBSP;STR2);        if  (strcmp (str1," Group ")  == 0) {             printf ("%s\n", &NBSP;STR3);         }else {             printf ("%.2f\n",  t);        }     }    fclose (Fr);     // free (Test_n_arr);     return 0;} 

Another example uses Strtok.

#include <stdio.h> #include <stdlib.h> #include <ctype.h> #include <string.h> #define  max _line 2048int main () {    file *fr;    fr =  fopen ("Test_group_box.txt",  "R");     if (NULL&NBSP;==&NBSP;FR) {         printf ("error!\n");         return - 1;    }    float t;    char *test_n_arr  =  (char*) malloc (sizeof (char)  *max_line);    char *str;     //   "Read each line of fr and assign each fields  to three pointers "    while  (!feof (Fr))  {         fgets (TEST_N_ARR,&NBSP;MAX_LINE,&NBSP;FR);         str = Strtok (test_n_arr,  "\ T");        int i = 0;         while (str != null) {             if ( i == 2) {                 if (strcmp (str,  "qual\n")  == 0) {                      printf ("%s",  str);                 } else {                     t = atof (str);                     printf ("%.2f\n",  t);                 }             }else {                 printf ("%s\t",  str);             }            i++;             str = strtok (NULL,  "\ T");         }    }    fclose (Fr);     free (Test_n_arr);     return 0;}

C language Atof,atoi, strtok and other functions usage