Atoi, Atol, Atoll, Atof function invocation instances in C + + under Linux

The four functions that are called in this article are as follows:

Atoi function: Converting a string to an int type variable

ATOL function: Converting a string to a long type variable

Atoll function: Converts a string to a long long type variable

Atof function: Converting a string to a double type variable

The conversion process of these functions is to take the readable part of a string into the variable

An unreadable portion is encountered and the read is terminated directly

Invocation Example:

#include  <stdio.h> #include  <stdlib.h> #define  seperate ();  printf ("\n=========== ==\n\n "); Int main () {    seperate ();    //atoi     printf ("atoi: string to integer\n");     const char* s00  =  "1234567890";     printf ("%s -> %d\n",  s00, atoi (& S00[0]);        const char* s01 =  "123.4";     printf ("%s -> %d\n",  s01, atoi (&s01[0]));     const char* s02 =  "XYZ";     printf ("%s -> %d\n", &NBSP;S02 ,  atoi (&s02[0]);    const char* s03 =  "1234XYZ";     printf ("%s -> %d\n",  s03, atoi (&s03[0]));     Seperate ();     //atol    printf ("atol: string to long\n");     const char* s10 =  "1234567890123";     printf ("%s ->  %ld\n ",  s10, atol (&s10[0));        const  char* s11 =  "123.4";     printf ("%s -> %ld\n", s11,  Atol (&s11[0]));    const char* s12 =  "XYZ";     printf ("%s -> %ld\n",  s12, atol (&s12[0]));    const  char* s13 =  "1234xyz";     printf ("%s -> %ld\n",  s13,  atol (&s13[0]);         seperate ();         //atoll    printf ("atoll: string to long long\ n ");     const char* s20 =  "1234567890123";     printf ("%s -> %lld\n",  s20, atoll (&s20[0]); &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;CONST&NBSP;CHAR*&NBSP;S21  =  "123.4";     printf ("%s -> %lld\n",  s21, atoll (&AMP;S21 [0]));     const char* s22 =  "XYZ";     printf ("%s - > %lld\n ",  s22, atoll (&s22[0));     const char* s23 =   "1234XYZ";     printf ("%s -> %lld\n",  s23, atoll (&s23[0])) ;         seperate ();    //atof     printf ("atof: string to double\n");     const char* s30  =  "1234567890";     printf ("%s -> %lf\n",  s30, atof (& S30[0]);         const char* s31 =  "123.4";     printf ("%s -> %lf\n",  s31, atof (&s31[0]));    const  char* s32 =  "XYZ";     printf ("%s -> %lf\n", s32,  Atof (&s32[0]);    const char* s33 =  "1234XYZ";     printf ("%s -> %lf\n",  s33, atof (&s33[0]));         seperate ();         return 0;}

Operating effect:

END

Atoi, Atol, Atoll, Atof function invocation instances in C + + under Linux