View Compilation Error

0_0_20011702_7479.c: In function 'main':
0_0_20011702_7479.c:30:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
    for(int k=i+1;k<n;k++)
    ^
0_0_20011702_7479.c:30:4: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_20011702_7479.c:38:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
    for(int j=money;j>=a[i].q;j--)
    ^