0_0_17271609_8056.c: In function 'init':
0_0_17271609_8056.c:12:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int z=1;z<=20;z++)
^
0_0_17271609_8056.c:12:2: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_17271609_8056.c:14:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int i=1;i<=20;i++)
^
0_0_17271609_8056.c:17:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int j=1;j<=i;j++)
^
0_0_17271609_8056.c: In function 'main':
0_0_17271609_8056.c:30:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int i=1;i<=n;i++)
^
0_0_17271609_8056.c:56:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int j=1;j<flag;j++)
^
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