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View Compilation Error

0_0_13857439_24269.c: In function 'main':
0_0_13857439_24269.c:14:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int j=0;j<=a-1;j++){
         ^
0_0_13857439_24269.c:14:9: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_13857439_24269.c:17:17: error: redefinition of 'j'
         for(int j=0;j<=a-1;j++){scanf("%s",str);
                 ^
0_0_13857439_24269.c:14:17: note: previous definition of 'j' was here
         for(int j=0;j<=a-1;j++){
                 ^
0_0_13857439_24269.c:17:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int j=0;j<=a-1;j++){scanf("%s",str);
         ^
0_0_13857439_24269.c:25:9: error: redefinition of 'j'
 for(int j=0;j<=mark-1;j++){if(num[j]>max) {max=num[j];markt=j;}}
         ^
0_0_13857439_24269.c:17:17: note: previous definition of 'j' was here
         for(int j=0;j<=a-1;j++){scanf("%s",str);
                 ^
0_0_13857439_24269.c:25:1: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
 for(int j=0;j<=mark-1;j++){if(num[j]>max) {max=num[j];markt=j;}}
 ^
0_0_13857439_24269.c:27:1: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
 for(int j=0;j<=i-1;j++) printf("%s\n",rec[j]);
 ^


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