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#include <stdio.h>
#include <string.h>
main()
{ 
	int i,j,c;
	char a[10];
	scanf("%c",a);
	for(i=0;j=strlen(a)-1;i<=j;i++;j--)
	{
		char c = a[i];
		a[i] = a[j];
		a[j] = c;
		return 0;
	}
	}
 

prog.c:4:1: warning: return type defaults to ‘int’ [-Wimplicit-int]
 main()
 ^~~~
prog.c: In function ‘main’:
prog.c:9:2: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  for(i=0;j=strlen(a)-1;i<=j;i++;j--)
  ^~~
prog.c:9:25: warning: statement with no effect [-Wunused-value]
  for(i=0;j=strlen(a)-1;i<=j;i++;j--)
                        ~^~~
prog.c:9:28: error: expected ‘)’ before ‘;’ token
  for(i=0;j=strlen(a)-1;i<=j;i++;j--)
                            ^
prog.c:6:10: warning: unused variable ‘c’ [-Wunused-variable]
  int i,j,c;
          ^

Standard output is empty