View Compilation Error

0_0_37068599_15695.c: In function 'main':
0_0_37068599_15695.c:13:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
    for(int j=0;j<x;j++)
    ^
0_0_37068599_15695.c:13:4: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_37068599_15695.c:17:12: error: redefinition of 'j'
    for(int j=0;j<x;j++)
            ^
0_0_37068599_15695.c:13:12: note: previous definition of 'j' was here
    for(int j=0;j<x;j++)
            ^
0_0_37068599_15695.c:17:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
    for(int j=0;j<x;j++)
    ^