0_0_37667932_19158.c: In function 'main':
0_0_37667932_19158.c:7:10: error: redeclaration of 'i' with no linkage
for(int i=0; i<21; i++)
^
0_0_37667932_19158.c:6:12: note: previous declaration of 'i' was here
int a,b,c,i,j,k;
^
0_0_37667932_19158.c:7:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int i=0; i<21; i++)
^
0_0_37667932_19158.c:7:2: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_37667932_19158.c:8:13: error: redeclaration of 'j' with no linkage
for(int j=0; j<21; j++)
^
0_0_37667932_19158.c:6:14: note: previous declaration of 'j' was here
int a,b,c,i,j,k;
^
0_0_37667932_19158.c:8:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int j=0; j<21; j++)
^
0_0_37667932_19158.c:9:14: error: redeclaration of 'k' with no linkage
for (int k=0; k<21; k++)
^
0_0_37667932_19158.c:6:16: note: previous declaration of 'k' was here
int a,b,c,i,j,k;
^
0_0_37667932_19158.c:9:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for (int k=0; k<21; k++)
^
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