C program To show examples of the strtol function.
strtol() function converts the string to the long integer, and strtol() can accept the number in various bases, and converts it into the decimal number or base. Read more about C Programming Language .

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#include <stdlib.h>

main()
{
 char num[10];

 /* Test a valid number  */
 strcpy(num,"13");

 printf("%s(Oct) is %i(Dec)n", num, strtol(num, NULL,  8));   
 printf("%s(Dec) is %i(Dec)n", num, strtol(num, NULL, 10));   
 printf("%s(hex) is %i(Dec)n", num, strtol(num, NULL, 16));   

 puts("----------------------------------");

 /* Test a slightly valid number
  * Returns the same results as 
  * above.    */
 strcpy(num, "13hzcd");

 printf("%s(Oct) is %i(Dec)n", num, strtol(num, NULL,  8));   
 printf("%s(Dec) is %i(Dec)n", num, strtol(num, NULL, 10));   
 printf("%s(hex) is %i(Dec)n", num, strtol(num, NULL, 16));   

 puts("----------------------------------");

 /* Test an invalid number
  * Returns ZERO   */
 strcpy(num, "hzcd");

 printf("%s(Oct) is %i(Dec)n", num, strtol(num, NULL,  8));   
 printf("%s(Dec) is %i(Dec)n", num, strtol(num, NULL, 10));   
 printf("%s(hex) is %i(Dec)n", num, strtol(num, NULL, 16));   


 puts("----------------------------------");

 /* Test 0 base.
  * This will look at the number 
  * and decide the base for its self!
  */
 strcpy(num, "13");
 printf("%s is %i(Dec)n", num, strtol(num, NULL, 0));   

 strcpy(num, "013");
 printf("%s is %i(Dec)n", num, strtol(num, NULL, 0));   

 strcpy(num, "0x13");
 printf("%s is %i(Dec)n", num, strtol(num, NULL, 0));   

}

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