#define TRUE 1#define FALSE 0#define STACK_SIZE 50   /*stack at most 50 elem*/#define TYPE floattypedef struct {        TYPE  elem[STACK_SIZE];        int top;}seqstack1;void Initstack1(seqstack1 *S){     S->top=-1;}int Push1(seqstack1 *S,  TYPE  x){    if (S->top==STACK_SIZE)        return(FALSE);      /*stack is full*/    S->top++;    S->elem[S->top] = x;    return (TRUE);}int Pop1(seqstack1 *S, TYPE  *x){    if(S->top==-1)       return(FALSE);   /*stack is empty*/    *x=S->elem[S->top];    S->top--;    return (TRUE);}float Gettop1(seqstack1 *S){    TYPE  x;    if(S->top==-1)       printf("There is no element!\n");    x=S->elem[S->top];    return x;}