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#include <stdio.h>
 
int result[10];
int check[10];
 
int go(int position,int n,int r){
int i;
int start=1;
 
if(position==r){
for(i=0;i<r;i++){
printf("%d ",result[i]);
}
printf("\n");
return;
}
 
if(position>0){
start=result[position-1]+1;
}
 
for(i=1;i<=n;i++){
if(check[i]=0){
check[i]=1;
result[position]=i;
go(position+1,n,r);
check[i]=0;
result[position]=0;
}
}
}
 
void main(){
int n=5
int r=5;
//scanf("%d %d",&n,&r);
go(0,n,r);
return 0;
}

prog.c: In function ‘go’:
prog.c:15:1: warning: ‘return’ with no value, in function returning non-void
 return;
 ^~~~~~
prog.c:6:5: note: declared here
 int go(int position,int n,int r){
     ^~
prog.c:23:1: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
 if(check[i]=0){
 ^~
prog.c:8:5: warning: variable ‘start’ set but not used [-Wunused-but-set-variable]
 int start=1;
     ^~~~~
prog.c: At top level:
prog.c:33:6: warning: return type of ‘main’ is not ‘int’ [-Wmain]
 void main(){
      ^~~~
prog.c: In function ‘main’:
prog.c:35:1: error: expected ‘,’ or ‘;’ before ‘int’
 int r=5;
 ^~~
prog.c:37:8: error: ‘r’ undeclared (first use in this function)
 go(0,n,r);
        ^
prog.c:37:8: note: each undeclared identifier is reported only once for each function it appears in
prog.c:38:8: warning: ‘return’ with a value, in function returning void
 return 0;
        ^
prog.c:33:6: note: declared here
 void main(){
      ^~~~

Standard output is empty