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#include <stdio.h>
#define N 10
 
int arr[];
int main(){
 
for(int i=0; i<10;i++){
scanf("%d", arr[i]);
}
 
 
for (i = 0; i < N - 1; i++)
{
index = i;
for (int j = i + 1; j < N; j++)
{
if (arr[index] > arr[j])
{
index = j;
}
}
temp = arr[index];
arr[index] = arr[i];
arr[i] = temp;
}
 
 
if( array[2]<60){
   printf("F");}
else if{ 59<array[2] && array[2]<65}
    printf("D+");}
else if{ 64<array[2] && array[2]<70}
    printf("D");}
else if{ 69<array[2] && array[2]<75}
    printf("C+");}
else if{ 5<array[2] && array[2]<85}
    printf("C");}
else if{ 79<array[2] && array[2]<86}
    printf("B");}
else if{ 84<array[2] && array[2]<90}
    printf("B+");}
else if{ 89<array[2] && array[2]<95}
    printf("A");}
ele printf("A+");
 
}

prog.c: In function 'main':
prog.c:8:7: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
 scanf("%d", arr[i]);
       ^
prog.c:12:6: error: 'i' undeclared (first use in this function)
 for (i = 0; i < N - 1; i++)
      ^
prog.c:12:6: note: each undeclared identifier is reported only once for each function it appears in
prog.c:14:1: error: 'index' undeclared (first use in this function)
 index = i;
 ^
prog.c:22:1: error: 'temp' undeclared (first use in this function)
 temp = arr[index];
 ^
prog.c:28:5: error: 'array' undeclared (first use in this function)
 if( array[2]<60){
     ^
prog.c:30:8: error: expected '(' before '{' token
 else if{ 59<array[2] && array[2]<65}
        ^
prog.c:30:10: warning: statement with no effect [-Wunused-value]
 else if{ 59<array[2] && array[2]<65}
          ^
prog.c: At top level:
prog.c:32:1: error: expected identifier or '(' before 'else'
 else if{ 64<array[2] && array[2]<70}
 ^
prog.c:33:12: error: expected declaration specifiers or '...' before string constant
     printf("D");}
            ^
prog.c:33:17: error: expected identifier or '(' before '}' token
     printf("D");}
                 ^
prog.c:34:1: error: expected identifier or '(' before 'else'
 else if{ 69<array[2] && array[2]<75}
 ^
prog.c:35:12: error: expected declaration specifiers or '...' before string constant
     printf("C+");}
            ^
prog.c:35:18: error: expected identifier or '(' before '}' token
     printf("C+");}
                  ^
prog.c:36:1: error: expected identifier or '(' before 'else'
 else if{ 5<array[2] && array[2]<85}
 ^
prog.c:37:12: error: expected declaration specifiers or '...' before string constant
     printf("C");}
            ^
prog.c:37:17: error: expected identifier or '(' before '}' token
     printf("C");}
                 ^
prog.c:38:1: error: expected identifier or '(' before 'else'
 else if{ 79<array[2] && array[2]<86}
 ^
prog.c:39:12: error: expected declaration specifiers or '...' before string constant
     printf("B");}
            ^
prog.c:39:17: error: expected identifier or '(' before '}' token
     printf("B");}
                 ^
prog.c:40:1: error: expected identifier or '(' before 'else'
 else if{ 84<array[2] && array[2]<90}
 ^
prog.c:41:12: error: expected declaration specifiers or '...' before string constant
     printf("B+");}
            ^
prog.c:41:18: error: expected identifier or '(' before '}' token
     printf("B+");}
                  ^
prog.c:42:1: error: expected identifier or '(' before 'else'
 else if{ 89<array[2] && array[2]<95}
 ^
prog.c:43:12: error: expected declaration specifiers or '...' before string constant
     printf("A");}
            ^
prog.c:43:17: error: expected identifier or '(' before '}' token
     printf("A");}
                 ^
prog.c:44:1: error: unknown type name 'ele'
 ele printf("A+");
 ^
prog.c:44:12: error: expected declaration specifiers or '...' before string constant
 ele printf("A+");
            ^
prog.c:46:1: error: expected identifier or '(' before '}' token
 }
 ^
prog.c:4:5: warning: array 'arr' assumed to have one element
 int arr[];
     ^

Standard output is empty