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    int N, E, E1, E2, k=0, u, n;
    float x, f, ch=1, zn=1, S=0, S1, S2, S3, ch1, zn1=1, ES=0;
 
    ch1=x;
    S=x;
 
 
    for (int i = 1; i <= N; i++){
        k += 2;
        ch = ch * (k-1);
        zn = zn * k;
        ch1 *= (-1)*x*x;
        zn1 += 2;
        S1 = ch1/zn1;
        S2 = ch/zn;
        S3 = S1*S2;
        a[i] = S3;
        S += S3;
    }

prog.cpp:4:5: error: ‘ch1’ does not name a type
     ch1=x;
     ^
prog.cpp:5:5: error: ‘S’ does not name a type
     S=x;
     ^
prog.cpp:8:5: error: expected unqualified-id before ‘for’
     for (int i = 1; i <= N; i++){
     ^
prog.cpp:8:21: error: ‘i’ does not name a type
     for (int i = 1; i <= N; i++){
                     ^
prog.cpp:8:29: error: ‘i’ does not name a type
     for (int i = 1; i <= N; i++){
                             ^

Standard output is empty