Write a program to find the reverse of a string in c using function?

Answer 1

#include <stdio.h>

#include <stdlib.h>

void reverse(FILE * file) {

int fscanf_return_value;

char x;

/* read a char */

fscanf_return_value = fscanf(file,"%c",&x) ;

if(fscanf_return_value == EOF) { //fscanf returns EOF as the END OF FILE

return;

}

reverse(file); //Get the next char

//do something with the char e.g. print

putchar(x);

return;

}

int main(int argc, char *argv[]) {

int i;

FILE *fd;

if (argc!=2) {

printf("Usage : \n %s FILENAME\n",argv[0]);

exit(0);

}

if(!(fd=fopen(argv[1],"r"))) {

printf("Opening file error\n");

exit(1);

}

reverse(fd);

printf("\n\n\t---\tenoD - Done\t---\n");

close(fd);

exit(0);

}

.....................if u like it get ask me more

my FB ID is phani.9885120096@gmail.com.

Answer 2

/* Write a C program to reverse the first n characters in a file.

(Note: The file name and n are specified on the command line.)*/

#include

#include

#include

#include

void main(int argc, char *argv[])

{

char a[15];

char s[20];

char n;

int k;

int j=0;

int i;

int len;

FILE *fp;

if(argc!=3)

{

puts("Improper number of arguments.");

exit(0);

}

fp = fopen(argv[1],"r");

if(fp == NULL)

{

puts("File cannot be opened.");

exit(0);

}

k=*argv[2]-48;

n = fread(a,1,k,fp);

a[n]='\0';

len=strlen(a);

for(i=len-1;i>=0;i--)

{

s[j]=a[i];

printf("%c",s[j]);

j=j+1;

}

s[j+1]='\0';

getch();

}

Answer 3

#include#include

void swap(char a, char b){

char temp = a;

a = b;

b = a;

}

void reverse(char str[]){

int i, j;

for( i=0, j=strlen(str)-1; i

swap(str[i], str[j]);

}

int main(){

char str[50];

printf("Enter the string:\t");

scanf("%s", str);

reverse(str);

printf("The string reversed:\t%s\n", str);

return 0;

}