View Compilation Error

0_0_13407374_6932.c: In function 'main':
0_0_13407374_6932.c:14:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
    for(int i = 1;i <= size;i++)
    ^
0_0_13407374_6932.c:14:4: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_13407374_6932.c:20:12: error: redefinition of 'i'
    for(int i = 1;i <= size;i++)
            ^
0_0_13407374_6932.c:14:12: note: previous definition of 'i' was here
    for(int i = 1;i <= size;i++)
            ^
0_0_13407374_6932.c:20:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
    for(int i = 1;i <= size;i++)
    ^