Code: #include <stdio.h> void string_reverse_function(char *,int); int main() { FILE *file_pointer; char buffer[100]; char read1; register int index = 0; file_pointer = fopen("input_file","r+"); memset(buffer,'\0',100); while((read1 = fgetc(file_pointer)) != EOF) { if((read1 == ' ') || (read1 == '\n')) { buffer[index] = '\0'; string_reverse_function(buffer,index); memset(buffer,'\0',100); index = 0; } else { buffer[index] = read1; index++; } } } void string_reverse_function(char word[],int length) { register int index; char temp; for(index = 0;index < length/2;index++) { temp = word[index]; word[index] = word[length -(1+index)]; word[length - (1 + index)] = temp; } printf("%s\n",word); }
yes sabbir u r right...... nadanasundaram it will be better if u will ask the explanation of one or two lines..... but explainiion the total is not difficult but hactic job...... so better state ur ur question a little better next time.... hav a gud day...
the above mentioned displays the contents of the files one by one (ie) each WORD in reverse order followed by a new line character..... SAMPLE i/p : ur file contains : I LOVE MY MOTHER INDIA Sample O/P : I EVOL YM REHTOM AIDNI ANALYSIS OF THE PROGRAM : 1) since in this program , a FILE contents is gonna be made use of , a file pointer is been declared. (line 5) 2) since you are going to store the file contents by taking it as WORD by WORD , that word is goin to be stored in a temperory Buffer array. (line 6) 3) but in file u can read only by character by character , to first read it from the file we have a character variable read1. (line 7) 4) for indexing that buffer array we have a index as a variable .(line 8) 5) for opening a file . we must use the function fopen() function..... inside that function the first argument is the file name , second is the opening mode of that file.. here opening mode is "r+" , where we can both read as well as write (used for updation).. 6) now comes a very important string function , memset(); , THE SYNTAX OF THIS IS : void memset (char *s , unsigned char ch , int bytes) a) where 's' denotes the starting address of the array , 'ch' refers to a particular character , 'bytes' refers , Till how many bytes i have to replace the character specified by 'ch' ..... b) then after using the function , upto the specified bytes it will be replaced by that character u have mentioned by 'ch'...... 7) now he has used , this function ..... so it fills the character '\0' upto 100 bytes of memory in the buffer array...... 8) now the program starts reading from the file , read1 gets character by character from the file pointer 'file_pointer'... and simultenously checks for END OF FILE (EOF).... 9) so next statement is , it is checking for spaces or Newline character.... since one of the termination condition for a word in english is SPACE or A NEW LINE... so the program checks for it........ 10) A) if the above if condition becomes TRUE (ie) if the file encounters SPACE or A NEW LINE , the present buffer index is made '\0' and sent to a function called string_reverse_function() , This function will thus reverse the string which is passed as an argument.......... LIKE THIS IT MOVES............... ........... ...... ... B) if the Above if statement is a FALSE (ie) the file is not encountering any SPACES or A NEW LINE , character by character is copied to the buffer array 11) Thus the program runs , and when the file encounters the EOF the while loop will terminate ................ hope this helps u .....:charming::charming: thank u
