foo.c:8:16: error: expected ':', ',', ';', '}' or '__attribute__' before '=' token
    8 |         int top=-1;
      |                ^
foo.c:11:19: error: expected ';', ',' or ')' before '&' token
   11 | void push(int x,s &p)
      |                   ^
foo.c:16:12: error: expected ';', ',' or ')' before '&' token
   16 | void pop(s &p)
      |            ^
foo.c: In function 'main':
foo.c:35:25: warning: implicit declaration of function 'push' [-Wimplicit-function-declaration]
   35 |                         push(j,s1);
      |                         ^~~~
foo.c:38:45: error: 's' {aka 'struct SqStack'} has no member named 'top'
   38 |                         for(int k=s1.data[s1.top]+1;k<j;k++)
      |                                             ^
foo.c:59:49: error: 's' {aka 'struct SqStack'} has no member named 'top'
   59 |                                 for(int k=0;k<s0.top;k++)
      |                                                 ^
foo.c:73:117: warning: suggest parentheses around arithmetic in operand of '|' [-Wparentheses]
   73 |                                                         s2[s0.data[k+1]]=(s2[s0.data[k]]-'0')|(s2[s0.data[k+1]]-'0')+'0';
      |                                                                                               ~~~~~~~~~~~~~~~~~~~~~~^~~~
foo.c:80:46: error: 's' {aka 'struct SqStack'} has no member named 'top'
   80 |                                 s2[s1.data[s1.top]]='\0';s2[j]='\0';
      |                                              ^
foo.c:81:33: warning: implicit declaration of function 'pop' [-Wimplicit-function-declaration]
   81 |                                 pop(s1);
      |                                 ^~~
foo.c:82:41: error: 's' {aka 'struct SqStack'} has no member named 'top'
   82 |                                 while(s0.top!=-1) pop(s0);
      |                                         ^
foo.c:106:33: error: 's' {aka 'struct SqStack'} has no member named 'top'
  106 |                 for(int k=0;k<s0.top;k++)
      |                                 ^
foo.c:120:101: warning: suggest parentheses around arithmetic in operand of '|' [-Wparentheses]
  120 |                                         s2[s0.data[k+1]]=(s2[s0.data[k]]-'0')|(s2[s0.data[k+1]]-'0')+'0';
      |                                                                               ~~~~~~~~~~~~~~~~~~~~~~^~~~

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