int isdigit(int ch) : isdigit « ctype.h « C / ANSI-C

1. C / ANSI-C
2. ctype.h
3. isdigit

int isdigit(int ch)

    

//Header file:     #include <ctype.h>  
//Declaration:     int isdigit(int ch); 
//Return:          returns nonzero if ch is a digit or zero is returned. 

  


  #include <ctype.h>
  #include <stdio.h>

  int main(void)
  {
    char ch;

    for(;;) {
      ch = getchar();
      if(ch == '.'){
          break;
      }
      if(isdigit(ch)){
          printf("%c is a digit\n", ch);
      }
    }

    return 0;
  }

         
/*
1
1 is a digit
2
2 is a digit
3
3 is a digit
f
.
*/
           
       

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