DISCUSSIONS


1.WRITE A PROGRAM TO CONVERT UPPER CASE TO LOWER CASE?
ANSWER

Conversion from uppercase to lower case using c program

#include
#include
int main(){
  char str[20];
  int i;
  printf("Enter any string->");
  scanf("%s",str);
  printf("The string is->%s",str);
  for(i=0;i<=strlen(str);i++){
      if(str[i]>=65&&str[i]<=90)
       str[i]=str[i]+32;
  }
  printf("\nThe string in uppercase is->%s",str);
  return 0;
}

Algorithm:

ASCII value of 'A' is 65 while 'a' is 97. Difference between them is 97 – 65 = 32
So if we will add 32 in the ASCII value of 'A' then it will be 'a' and if will we subtract 32 in ASCII value of 'a' it will be 'A'. It is true for all alphabets.
In general rule:
Upper case character = Lower case character – 32
Lower case character = Upper case character + 32

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2 comments:

  1. Balaji30 December 2011 at 11:42

    What is the difference between "calloc(...)" and "malloc(...)"?

    ReplyDelete
  2. dee30 December 2011 at 11:45

    1. calloc(...) allocates a block of memory for an array of elements of a certain size. By default the block is initialized to 0. The total number of memory allocated will be (number_of_elements * size).

    malloc(...) takes in only a single argument which is the memory required in bytes. malloc(...) allocated bytes of memory and not blocks of memory like calloc(...).

    2. malloc(...) allocates memory blocks and returns a void pointer to the allocated space, or NULL if there is insufficient memory available.

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