Language: C

#include<stdio.h>
int main(void){
  int sx,sy,tx,ty,i,x,y;
  scanf("%d%d%d%d",&sx,&sy,&tx,&ty);
  x=tx-sx;
  y=ty-sy;
  for(i=1;i<=y;i++){
    printf("U");//一回目行きy
  }
  for(i=1;i<=x;i++)
  printf("R");//一回目行きx
}
for(i=1;i<=y;i++)
  printf("D");//一回目帰りy
}
for(i=1;i<=x;i++)
  printf("L");//一回目帰りx
}
//二回目行き
printf("L");
 for(i=1;i<=y+1;i++){
    printf("U");//二回目行きy
  }
 for(i=1;i<=x+1;i++){
    printf("R");//二回目行きx
  }
printf("D");
//二回目帰り
printf("R");
 for(i=1;i<=y+1;i++){
    printf("D");//二回目帰りy
  }
   for(i=1;i<=x+1;i++){
    printf("L");//二回目帰りx
  }
printf("U\n");
return 0;
}
    
  

Compiler output:
main.c:13:1: error: expected identifier or '(' before 'for'
   13 | for(i=1;i<=y;i++)
      | ^~~
main.c:13:10: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<=' token
   13 | for(i=1;i<=y;i++)
      |          ^~
main.c:13:15: error: expected '=', ',', ';', 'asm' or '__attribute__' before '++' token
   13 | for(i=1;i<=y;i++)
      |               ^~
main.c:15:1: error: expected identifier or '(' before '}' token
   15 | }
      | ^
main.c:16:1: error: expected identifier or '(' before 'for'
   16 | for(i=1;i<=x;i++)
      | ^~~
main.c:16:10: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<=' token
   16 | for(i=1;i<=x;i++)
      |          ^~
main.c:16:15: error: expected '=', ',', ';', 'asm' or '__attribute__' before '++' token
   16 | for(i=1;i<=x;i++)
      |               ^~
main.c:18:1: error: expected identifier or '(' before '}' token
   18 | }
      | ^
main.c:20:8: error: expected declaration specifiers or '...' before string constant
   20 | printf("L");
      |        ^~~
main.c:21:2: error: expected identifier or '(' before 'for'
   21 |  for(i=1;i<=y+1;i++){
      |  ^~~
main.c:21:11: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<=' token
   21 |  for(i=1;i<=y+1;i++){
      |           ^~
main.c:21:18: error: expected '=', ',', ';', 'asm' or '__attribute__' before '++' token
   21 |  for(i=1;i<=y+1;i++){
      |                  ^~
main.c:24:2: error: expected identifier or '(' before 'for'
   24 |  for(i=1;i<=x+1;i++){
      |  ^~~
main.c:24:11: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<=' token
   24 |  for(i=1;i<=x+1;i++){
      |           ^~
main.c:24:18: error: expected '=', ',', ';', 'asm' or '__attribute__' before '++' token
   24 |  for(i=1;i<=x+1;i++){
      |                  ^~
main.c:27:8: error: expected declaration specifiers or '...' before string constant
   27 | printf("D");
      |        ^~~
main.c:29:8: error: expected declaration specifiers or '...' before string constant
   29 | printf("R");
      |        ^~~
main.c:30:2: error: expected identifier or '(' before 'for'
   30 |  for(i=1;i<=y+1;i++){
      |  ^~~
main.c:30:11: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<=' token
   30 |  for(i=1;i<=y+1;i++){
      |           ^~
main.c:30:18: error: expected '=', ',', ';', 'asm' or '__attribute__' before '++' token
   30 |  for(i=1;i<=y+1;i++){
      |                  ^~
main.c:33:4: error: expected identifier or '(' before 'for'
   33 |    for(i=1;i<=x+1;i++){
      |    ^~~
main.c:33:13: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<=' token
   33 |    for(i=1;i<=x+1;i++){
      |             ^~
main.c:33:20: error: expected '=', ',', ';', 'asm' or '__attribute__' before '++' token
   33 |    for(i=1;i<=x+1;i++){
      |                    ^~
main.c:36:8: error: expected declaration specifiers or '...' before string constant
   36 | printf("U\n");
      |        ^~~~~
main.c:37:1: error: expected identifier or '(' before 'return'
   37 | return 0;
      | ^~~~~~
main.c:38:1: error: expected identifier or '(' before '}' token
   38 | }
      | ^