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char* reverse(char*);    
main()
{
printf("\n%s", reverse("computer"));
}
char* reverse(char *p)
{
int l,i;
char t;
for(l=0;*(p+l)!='\0';l++);
for(i=0;i<l/2;i++)
{
t=*(p+i);
*(p+i)=*(p+l-1-i);
*(p+l-1-i)=t;
}
return(p);
}    
 

prog.c:2:1: error: return type defaults to ‘int’ [-Werror=implicit-int]
 main()
 ^~~~
prog.c: In function ‘main’:
prog.c:4:1: error: implicit declaration of function ‘printf’ [-Werror=implicit-function-declaration]
 printf("\n%s", reverse("computer"));
 ^~~~~~
prog.c:4:1: error: incompatible implicit declaration of built-in function ‘printf’ [-Werror]
prog.c:4:1: note: include ‘<stdio.h>’ or provide a declaration of ‘printf’
cc1: all warnings being treated as errors

Standard output is empty