C program to print upper and lower case letters

C program to print upper and lower case letters

Output:

Enter a string or sentence:

CodeRegister Is A LeaRninG PortaL FoR ComPuteR SciencE AspiRantS!

The lowercase characters in the entered sentence / string are:
o d e e g i s t e r s e a n i n o r t a o o m u t e c i e n c s p i a n t 

The uppercase characters in the entered sentence / string are:
C R I A L R G P L F R C P R S E A R S 

Implementation:

#include <stdio.h> #define MAX 1000000 int main(void) { char *s; int i; s=(char*)malloc(sizeof(char)*MAX); printf("Enter a string or sentence:\n"); gets(s); i=0; printf("\nThe lowercase characters in the entered sentence / string are:\n"); while(*(s+i)) { if(*(s+i)>='a' && *(s+i)<='z') printf("%c ",*(s+i)); i++; } i=0; printf("\n\nThe uppercase characters in the entered sentence / string are:\n"); while(*(s+i)) { if(*(s+i)>='A' && *(s+i)<='Z') printf("%c ",*(s+i)); i++; } return 0; }