View Compilation Error

0_0_25584521_12531.c: In function 'main':
0_0_25584521_12531.c:9:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int i=0; i<c; i++)
         ^
0_0_25584521_12531.c:9:9: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_25584521_12531.c:10:13: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
             for(int j=1; j<=5; j++)
             ^
0_0_25584521_12531.c:13:17: error: redefinition of 'i'
         for(int i=0; i<7; i++)
                 ^
0_0_25584521_12531.c:9:17: note: previous definition of 'i' was here
         for(int i=0; i<c; i++)
                 ^
0_0_25584521_12531.c:13:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int i=0; i<7; i++)
         ^
0_0_25584521_12531.c:15:13: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
             for(int j=1,k=1; j<=5*c; j++,k++)
             ^